| products/Sources/formale Sprachen/C/Linux/net/core/ (Linux Kernel Version 6.17.9©) Datei vom 24.10.2025 mit Größe 101 kB |
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Quelle pktgen.c Sprache: C |
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// SPDX-License-Identifier: GPL-2.0-or-later /* * Authors: * Copyright 2001, 2002 by Robert Olsson <robert.olsson@its.uu.se> * Uppsala University and * Swedish University of Agricultural Sciences * * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> * Ben Greear <greearb@candelatech.com> * Jens Låås <jens.laas@data.slu.se> * * A tool for loading the network with preconfigurated packets. * The tool is implemented as a linux module. Parameters are output * device, delay (to hard_xmit), number of packets, and whether * to use multiple SKBs or just the same one. * pktgen uses the installed interface's output routine. * * Additional hacking by: * * Jens.Laas@data.slu.se * Improved by ANK. 010120. * Improved by ANK even more. 010212. * MAC address typo fixed. 010417 --ro * Integrated. 020301 --DaveM * Added multiskb option 020301 --DaveM * Scaling of results. 020417--sigurdur@linpro.no * Significant re-work of the module: * * Convert to threaded model to more efficiently be able to transmit * and receive on multiple interfaces at once. * * Converted many counters to __u64 to allow longer runs. * * Allow configuration of ranges, like min/max IP address, MACs, * and UDP-ports, for both source and destination, and can * set to use a random distribution or sequentially walk the range. * * Can now change most values after starting. * * Place 12-byte packet in UDP payload with magic number, * sequence number, and timestamp. * * Add receiver code that detects dropped pkts, re-ordered pkts, and * latencies (with micro-second) precision. * * Add IOCTL interface to easily get counters & configuration. * --Ben Greear <greearb@candelatech.com> * * Renamed multiskb to clone_skb and cleaned up sending core for two distinct * skb modes. A clone_skb=0 mode for Ben "ranges" work and a clone_skb != 0 * as a "fastpath" with a configurable number of clones after alloc's. * clone_skb=0 means all packets are allocated this also means ranges time * stamps etc can be used. clone_skb=100 means 1 malloc is followed by 100 * clones. * * Also moved to /proc/net/pktgen/ * --ro * * Sept 10: Fixed threading/locking. Lots of bone-headed and more clever * mistakes. Also merged in DaveM's patch in the -pre6 patch. * --Ben Greear <greearb@candelatech.com> * * Integrated to 2.5.x 021029 --Lucio Maciel (luciomaciel@zipmail.com.br) * * 021124 Finished major redesign and rewrite for new functionality. * See Documentation/networking/pktgen.rst for how to use this. * * The new operation: * For each CPU one thread/process is created at start. This process checks * for running devices in the if_list and sends packets until count is 0 it * also the thread checks the thread->control which is used for inter-process * communication. controlling process "posts" operations to the threads this * way. * The if_list is RCU protected, and the if_lock remains to protect updating * of if_list, from "add_device" as it invoked from userspace (via proc write). * * By design there should only be *one* "controlling" process. In practice * multiple write accesses gives unpredictable result. Understood by "write" * to /proc gives result code that should be read be the "writer". * For practical use this should be no problem. * * Note when adding devices to a specific CPU there good idea to also assign * /proc/irq/XX/smp_affinity so TX-interrupts gets bound to the same CPU. * --ro * * Fix refcount off by one if first packet fails, potential null deref, * memleak 030710- KJP * * First "ranges" functionality for ipv6 030726 --ro * * Included flow support. 030802 ANK. * * Fixed unaligned access on IA-64 Grant Grundler <grundler@parisc-linux.org> * * Remove if fix from added Harald Welte <laforge@netfilter.org> 040419 * ia64 compilation fix from Aron Griffis <aron@hp.com> 040604 * * New xmit() return, do_div and misc clean up by Stephen Hemminger * <shemminger@osdl.org> 040923 * * Randy Dunlap fixed u64 printk compiler warning * * Remove FCS from BW calculation. Lennert Buytenhek <buytenh@wantstofly.org> * New time handling. Lennert Buytenhek <buytenh@wantstofly.org> 041213 * * Corrections from Nikolai Malykh (nmalykh@bilim.com) * Removed unused flags F_SET_SRCMAC & F_SET_SRCIP 041230 * * interruptible_sleep_on_timeout() replaced Nishanth Aravamudan <nacc@us.ibm.com> * 050103 * * MPLS support by Steven Whitehouse <steve@chygwyn.com> * * 802.1Q/Q-in-Q support by Francesco Fondelli (FF) <francesco.fondelli@gmail.com> * * Fixed src_mac command to set source mac of packet to value specified in * command by Adit Ranadive <adit.262@gmail.com> */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/sys.h> #include <linux/types.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/kernel.h> #include <linux/mutex.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/unistd.h> #include <linux/string.h> #include <linux/ptrace.h> #include <linux/errno.h> #include <linux/ioport.h> #include <linux/interrupt.h> #include <linux/capability.h> #include <linux/hrtimer.h> #include <linux/freezer.h> #include <linux/delay.h> #include <linux/timer.h> #include <linux/list.h> #include <linux/init.h> #include <linux/skbuff.h> #include <linux/netdevice.h> #include <linux/inet.h> #include <linux/inetdevice.h> #include <linux/rtnetlink.h> #include <linux/if_arp.h> #include <linux/if_vlan.h> #include <linux/in.h> #include <linux/ip.h> #include <linux/ipv6.h> #include <linux/udp.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/wait.h> #include <linux/etherdevice.h> #include <linux/kthread.h> #include <linux/prefetch.h> #include <linux/mmzone.h> #include <net/net_namespace.h> #include <net/checksum.h> #include <net/ipv6.h> #include <net/udp.h> #include <net/ip6_checksum.h> #include <net/addrconf.h> #include <net/xfrm.h> #include <net/netns/generic.h> #include <asm/byteorder.h> #include <linux/rcupdate.h> #include <linux/bitops.h> #include <linux/io.h> #include <linux/timex.h> #include <linux/uaccess.h> #include <asm/dma.h> #include <asm/div64.h> /* do_div */ #define VERSION "2.75" #define IP_NAME_SZ 32 #define MAX_MPLS_LABELS 16 /* This is the max label stack depth */ #define MPLS_STACK_BOTTOM htonl(0x00000100) /* Max number of internet mix entries that can be specified in imix_weights. */ #define MAX_IMIX_ENTRIES 20 #define IMIX_PRECISION 100 /* Precision of IMIX distribution */ #define func_enter() pr_debug("entering %s\n", __func__) #define PKT_FLAGS \ pf(IPV6) /* Interface in IPV6 Mode */ \ pf(IPSRC_RND) /* IP-Src Random */ \ pf(IPDST_RND) /* IP-Dst Random */ \ pf(TXSIZE_RND) /* Transmit size is random */ \ pf(UDPSRC_RND) /* UDP-Src Random */ \ pf(UDPDST_RND) /* UDP-Dst Random */ \ pf(UDPCSUM) /* Include UDP checksum */ \ pf(NO_TIMESTAMP) /* Don't timestamp packets (default TS) */ \ pf(MPLS_RND) /* Random MPLS labels */ \ pf(QUEUE_MAP_RND) /* queue map Random */ \ pf(QUEUE_MAP_CPU) /* queue map mirrors smp_processor_id() */ \ pf(FLOW_SEQ) /* Sequential flows */ \ pf(IPSEC) /* ipsec on for flows */ \ pf(MACSRC_RND) /* MAC-Src Random */ \ pf(MACDST_RND) /* MAC-Dst Random */ \ pf(VID_RND) /* Random VLAN ID */ \ pf(SVID_RND) /* Random SVLAN ID */ \ pf(NODE) /* Node memory alloc*/ \ pf(SHARED) /* Shared SKB */ \ #define pf(flag) flag##_SHIFT, enum pkt_flags { PKT_FLAGS }; #undef pf /* Device flag bits */ #define pf(flag) static const __u32 F_##flag = (1<<flag##_SHIFT); PKT_FLAGS #undef pf #define pf(flag) __stringify(flag), static char *pkt_flag_names[] = { PKT_FLAGS }; #undef pf #define NR_PKT_FLAGS ARRAY_SIZE(pkt_flag_names) /* Thread control flag bits */ #define T_STOP (1<<0) /* Stop run */ #define T_RUN (1<<1) /* Start run */ #define T_REMDEVALL (1<<2) /* Remove all devs */ #define T_REMDEV (1<<3) /* Remove one dev */ /* Xmit modes */ #define M_START_XMIT 0 /* Default normal TX */ #define M_NETIF_RECEIVE 1 /* Inject packets into stack */ #define M_QUEUE_XMIT 2 /* Inject packet into qdisc */ /* If lock -- protects updating of if_list */ #define if_lock(t) mutex_lock(&(t->if_lock)) #define if_unlock(t) mutex_unlock(&(t->if_lock)) /* Used to help with determining the pkts on receive */ #define PKTGEN_MAGIC 0xbe9be955 #define PG_PROC_DIR "pktgen" #define PGCTRL "pgctrl" #define MAX_CFLOWS 65536 #define VLAN_TAG_SIZE(x) ((x)->vlan_id == 0xffff ? 0 : 4) #define SVLAN_TAG_SIZE(x) ((x)->svlan_id == 0xffff ? 0 : 4) struct imix_pkt { u64 size; u64 weight; u64 count_so_far; }; struct flow_state { __be32 cur_daddr; int count; #ifdef CONFIG_XFRM struct xfrm_state *x; #endif __u32 flags; }; /* flow flag bits */ #define F_INIT (1<<0) /* flow has been initialized */ struct pktgen_dev { /* * Try to keep frequent/infrequent used vars. separated. */ struct proc_dir_entry *entry; /* proc file */ struct pktgen_thread *pg_thread;/* the owner */ struct list_head list; /* chaining in the thread's run-queue */ struct rcu_head rcu; /* freed by RCU */ int running; /* if false, the test will stop */ /* If min != max, then we will either do a linear iteration, or * we will do a random selection from within the range. */ __u32 flags; int xmit_mode; int min_pkt_size; int max_pkt_size; int pkt_overhead; /* overhead for MPLS, VLANs, IPSEC etc */ int nfrags; int removal_mark; /* non-zero => the device is marked for * removal by worker thread */ struct page *page; u64 delay; /* nano-seconds */ __u64 count; /* Default No packets to send */ __u64 sofar; /* How many pkts we've sent so far */ __u64 tx_bytes; /* How many bytes we've transmitted */ __u64 errors; /* Errors when trying to transmit, */ /* runtime counters relating to clone_skb */ __u32 clone_count; int last_ok; /* Was last skb sent? * Or a failed transmit of some sort? * This will keep sequence numbers in order */ ktime_t next_tx; ktime_t started_at; ktime_t stopped_at; u64 idle_acc; /* nano-seconds */ __u32 seq_num; int clone_skb; /* * Use multiple SKBs during packet gen. * If this number is greater than 1, then * that many copies of the same packet will be * sent before a new packet is allocated. * If you want to send 1024 identical packets * before creating a new packet, * set clone_skb to 1024. */ char dst_min[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */ char dst_max[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */ char src_min[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */ char src_max[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */ struct in6_addr in6_saddr; struct in6_addr in6_daddr; struct in6_addr cur_in6_daddr; struct in6_addr cur_in6_saddr; /* For ranges */ struct in6_addr min_in6_daddr; struct in6_addr max_in6_daddr; struct in6_addr min_in6_saddr; struct in6_addr max_in6_saddr; /* If we're doing ranges, random or incremental, then this * defines the min/max for those ranges. */ __be32 saddr_min; /* inclusive, source IP address */ __be32 saddr_max; /* exclusive, source IP address */ __be32 daddr_min; /* inclusive, dest IP address */ __be32 daddr_max; /* exclusive, dest IP address */ __u16 udp_src_min; /* inclusive, source UDP port */ __u16 udp_src_max; /* exclusive, source UDP port */ __u16 udp_dst_min; /* inclusive, dest UDP port */ __u16 udp_dst_max; /* exclusive, dest UDP port */ /* DSCP + ECN */ __u8 tos; /* six MSB of (former) IPv4 TOS * are for dscp codepoint */ __u8 traffic_class; /* ditto for the (former) Traffic Class in IPv6 * (see RFC 3260, sec. 4) */ /* IMIX */ unsigned int n_imix_entries; struct imix_pkt imix_entries[MAX_IMIX_ENTRIES]; /* Maps 0-IMIX_PRECISION range to imix_entry based on probability*/ __u8 imix_distribution[IMIX_PRECISION]; /* MPLS */ unsigned int nr_labels; /* Depth of stack, 0 = no MPLS */ __be32 labels[MAX_MPLS_LABELS]; /* VLAN/SVLAN (802.1Q/Q-in-Q) */ __u8 vlan_p; __u8 vlan_cfi; __u16 vlan_id; /* 0xffff means no vlan tag */ __u8 svlan_p; __u8 svlan_cfi; __u16 svlan_id; /* 0xffff means no svlan tag */ __u32 src_mac_count; /* How many MACs to iterate through */ __u32 dst_mac_count; /* How many MACs to iterate through */ unsigned char dst_mac[ETH_ALEN]; unsigned char src_mac[ETH_ALEN]; __u32 cur_dst_mac_offset; __u32 cur_src_mac_offset; __be32 cur_saddr; __be32 cur_daddr; __u16 ip_id; __u16 cur_udp_dst; __u16 cur_udp_src; __u16 cur_queue_map; __u32 cur_pkt_size; __u32 last_pkt_size; __u8 hh[14]; /* = { * 0x00, 0x80, 0xC8, 0x79, 0xB3, 0xCB, * * We fill in SRC address later * 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, * 0x08, 0x00 * }; */ __u16 pad; /* pad out the hh struct to an even 16 bytes */ struct sk_buff *skb; /* skb we are to transmit next, used for when we * are transmitting the same one multiple times */ struct net_device *odev; /* The out-going device. * Note that the device should have it's * pg_info pointer pointing back to this * device. * Set when the user specifies the out-going * device name (not when the inject is * started as it used to do.) */ netdevice_tracker dev_tracker; char odevname[32]; struct flow_state *flows; unsigned int cflows; /* Concurrent flows (config) */ unsigned int lflow; /* Flow length (config) */ unsigned int nflows; /* accumulated flows (stats) */ unsigned int curfl; /* current sequenced flow (state)*/ u16 queue_map_min; u16 queue_map_max; __u32 skb_priority; /* skb priority field */ unsigned int burst; /* number of duplicated packets to burst */ int node; /* Memory node */ #ifdef CONFIG_XFRM __u8 ipsmode; /* IPSEC mode (config) */ __u8 ipsproto; /* IPSEC type (config) */ __u32 spi; struct xfrm_dst xdst; struct dst_ops dstops; #endif char result[512]; }; struct pktgen_hdr { __be32 pgh_magic; __be32 seq_num; __be32 tv_sec; __be32 tv_usec; }; static unsigned int pg_net_id __read_mostly; struct pktgen_net { struct net *net; struct proc_dir_entry *proc_dir; struct list_head pktgen_threads; bool pktgen_exiting; }; struct pktgen_thread { struct mutex if_lock; /* for list of devices */ struct list_head if_list; /* All device here */ struct list_head th_list; struct task_struct *tsk; char result[512]; /* Field for thread to receive "posted" events terminate, * stop ifs etc. */ u32 control; int cpu; wait_queue_head_t queue; struct completion start_done; struct pktgen_net *net; }; #define REMOVE 1 #define FIND 0 static const char version[] = "Packet Generator for packet performance testing. Version: " VERSION "\n"; static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *i); static int pktgen_add_device(struct pktgen_thread *t, const char *ifname); static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t, const char *ifname, bool exact); static int pktgen_device_event(struct notifier_block *, unsigned long, void *); static void pktgen_run_all_threads(struct pktgen_net *pn); static void pktgen_reset_all_threads(struct pktgen_net *pn); static void pktgen_stop_all_threads(struct pktgen_net *pn); static void pktgen_stop(struct pktgen_thread *t); static void pktgen_clear_counters(struct pktgen_dev *pkt_dev); static void fill_imix_distribution(struct pktgen_dev *pkt_dev); /* Module parameters, defaults. */ static int pg_count_d __read_mostly = 1000; static int pg_delay_d __read_mostly; static int pg_clone_skb_d __read_mostly; static int debug __read_mostly; static DEFINE_MUTEX(pktgen_thread_lock); static struct notifier_block pktgen_notifier_block = { .notifier_call = pktgen_device_event, }; /* * /proc handling functions * */ static int pgctrl_show(struct seq_file *seq, void *v) { seq_puts(seq, version); return 0; } static ssize_t pgctrl_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { char data[128]; size_t max; struct pktgen_net *pn = net_generic(current->nsproxy->net_ns, pg_net_id); if (!capable(CAP_NET_ADMIN)) return -EPERM; if (count < 1) return -EINVAL; max = min(count, sizeof(data) - 1); if (copy_from_user(data, buf, max)) return -EFAULT; if (data[max - 1] == '\n') data[max - 1] = 0; /* strip trailing '\n', terminate string */ else data[max] = 0; /* terminate string */ if (!strcmp(data, "stop")) pktgen_stop_all_threads(pn); else if (!strcmp(data, "start")) pktgen_run_all_threads(pn); else if (!strcmp(data, "reset")) pktgen_reset_all_threads(pn); else return -EINVAL; return count; } static int pgctrl_open(struct inode *inode, struct file *file) { return single_open(file, pgctrl_show, pde_data(inode)); } static const struct proc_ops pktgen_proc_ops = { .proc_open = pgctrl_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_write = pgctrl_write, .proc_release = single_release, }; static int pktgen_if_show(struct seq_file *seq, void *v) { const struct pktgen_dev *pkt_dev = seq->private; ktime_t stopped; unsigned int i; u64 idle; seq_printf(seq, "Params: count %llu min_pkt_size: %u max_pkt_size: %u\n", (unsigned long long)pkt_dev->count, pkt_dev->min_pkt_size, pkt_dev->max_pkt_size); if (pkt_dev->n_imix_entries > 0) { seq_puts(seq, " imix_weights: "); for (i = 0; i < pkt_dev->n_imix_entries; i++) { seq_printf(seq, "%llu,%llu ", pkt_dev->imix_entries[i].size, pkt_dev->imix_entries[i].weight); } seq_puts(seq, "\n"); } seq_printf(seq, " frags: %d delay: %llu clone_skb: %d ifname: %s\n", pkt_dev->nfrags, (unsigned long long) pkt_dev->delay, pkt_dev->clone_skb, pkt_dev->odevname); seq_printf(seq, " flows: %u flowlen: %u\n", pkt_dev->cflows, pkt_dev->lflow); seq_printf(seq, " queue_map_min: %u queue_map_max: %u\n", pkt_dev->queue_map_min, pkt_dev->queue_map_max); if (pkt_dev->skb_priority) seq_printf(seq, " skb_priority: %u\n", pkt_dev->skb_priority); if (pkt_dev->flags & F_IPV6) { seq_printf(seq, " saddr: %pI6c min_saddr: %pI6c max_saddr: %pI6c\n" " daddr: %pI6c min_daddr: %pI6c max_daddr: %pI6c\n", &pkt_dev->in6_saddr, &pkt_dev->min_in6_saddr, &pkt_dev->max_in6_saddr, &pkt_dev->in6_daddr, &pkt_dev->min_in6_daddr, &pkt_dev->max_in6_daddr); } else { seq_printf(seq, " dst_min: %s dst_max: %s\n", pkt_dev->dst_min, pkt_dev->dst_max); seq_printf(seq, " src_min: %s src_max: %s\n", pkt_dev->src_min, pkt_dev->src_max); } seq_puts(seq, " src_mac: "); seq_printf(seq, "%pM ", is_zero_ether_addr(pkt_dev->src_mac) ? pkt_dev->odev->dev_addr : pkt_dev->src_mac); seq_puts(seq, "dst_mac: "); seq_printf(seq, "%pM\n", pkt_dev->dst_mac); seq_printf(seq, " udp_src_min: %d udp_src_max: %d udp_dst_min: %d udp_dst_max: %d\n", pkt_dev->udp_src_min, pkt_dev->udp_src_max, pkt_dev->udp_dst_min, pkt_dev->udp_dst_max); seq_printf(seq, " src_mac_count: %d dst_mac_count: %d\n", pkt_dev->src_mac_count, pkt_dev->dst_mac_count); if (pkt_dev->nr_labels) { seq_puts(seq, " mpls: "); for (i = 0; i < pkt_dev->nr_labels; i++) seq_printf(seq, "%08x%s", ntohl(pkt_dev->labels[i]), i == pkt_dev->nr_labels-1 ? "\n" : ", "); } if (pkt_dev->vlan_id != 0xffff) seq_printf(seq, " vlan_id: %u vlan_p: %u vlan_cfi: %u\n", pkt_dev->vlan_id, pkt_dev->vlan_p, pkt_dev->vlan_cfi); if (pkt_dev->svlan_id != 0xffff) seq_printf(seq, " svlan_id: %u vlan_p: %u vlan_cfi: %u\n", pkt_dev->svlan_id, pkt_dev->svlan_p, pkt_dev->svlan_cfi); if (pkt_dev->tos) seq_printf(seq, " tos: 0x%02x\n", pkt_dev->tos); if (pkt_dev->traffic_class) seq_printf(seq, " traffic_class: 0x%02x\n", pkt_dev->traffic_class); if (pkt_dev->burst > 1) seq_printf(seq, " burst: %d\n", pkt_dev->burst); if (pkt_dev->node >= 0) seq_printf(seq, " node: %d\n", pkt_dev->node); if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) seq_puts(seq, " xmit_mode: netif_receive\n"); else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) seq_puts(seq, " xmit_mode: xmit_queue\n"); seq_puts(seq, " Flags: "); for (i = 0; i < NR_PKT_FLAGS; i++) { if (i == FLOW_SEQ_SHIFT) if (!pkt_dev->cflows) continue; if (pkt_dev->flags & (1 << i)) { seq_printf(seq, "%s ", pkt_flag_names[i]); #ifdef CONFIG_XFRM if (i == IPSEC_SHIFT && pkt_dev->spi) seq_printf(seq, "spi:%u ", pkt_dev->spi); #endif } else if (i == FLOW_SEQ_SHIFT) { seq_puts(seq, "FLOW_RND "); } } seq_puts(seq, "\n"); /* not really stopped, more like last-running-at */ stopped = pkt_dev->running ? ktime_get() : pkt_dev->stopped_at; idle = pkt_dev->idle_acc; do_div(idle, NSEC_PER_USEC); seq_printf(seq, "Current:\n pkts-sofar: %llu errors: %llu\n", (unsigned long long)pkt_dev->sofar, (unsigned long long)pkt_dev->errors); if (pkt_dev->n_imix_entries > 0) { int i; seq_puts(seq, " imix_size_counts: "); for (i = 0; i < pkt_dev->n_imix_entries; i++) { seq_printf(seq, "%llu,%llu ", pkt_dev->imix_entries[i].size, pkt_dev->imix_entries[i].count_so_far); } seq_puts(seq, "\n"); } seq_printf(seq, " started: %lluus stopped: %lluus idle: %lluus\n", (unsigned long long) ktime_to_us(pkt_dev->started_at), (unsigned long long) ktime_to_us(stopped), (unsigned long long) idle); seq_printf(seq, " seq_num: %d cur_dst_mac_offset: %d cur_src_mac_offset: %d\n", pkt_dev->seq_num, pkt_dev->cur_dst_mac_offset, pkt_dev->cur_src_mac_offset); if (pkt_dev->flags & F_IPV6) { seq_printf(seq, " cur_saddr: %pI6c cur_daddr: %pI6c\n", &pkt_dev->cur_in6_saddr, &pkt_dev->cur_in6_daddr); } else seq_printf(seq, " cur_saddr: %pI4 cur_daddr: %pI4\n", &pkt_dev->cur_saddr, &pkt_dev->cur_daddr); seq_printf(seq, " cur_udp_dst: %d cur_udp_src: %d\n", pkt_dev->cur_udp_dst, pkt_dev->cur_udp_src); seq_printf(seq, " cur_queue_map: %u\n", pkt_dev->cur_queue_map); seq_printf(seq, " flows: %u\n", pkt_dev->nflows); if (pkt_dev->result[0]) seq_printf(seq, "Result: %s\n", pkt_dev->result); else seq_puts(seq, "Result: Idle\n"); return 0; } static ssize_t hex32_arg(const char __user *user_buffer, size_t maxlen, __u32 *num) { size_t i = 0; *num = 0; for (; i < maxlen; i++) { int value; char c; if (get_user(c, &user_buffer[i])) return -EFAULT; value = hex_to_bin(c); if (value >= 0) { *num <<= 4; *num |= value; } else { break; } } return i; } static ssize_t count_trail_chars(const char __user *user_buffer, size_t maxlen) { size_t i; for (i = 0; i < maxlen; i++) { char c; if (get_user(c, &user_buffer[i])) return -EFAULT; switch (c) { case '\"': case '\n': case '\r': case '\t': case ' ': case '=': break; default: goto done; } } done: return i; } static ssize_t num_arg(const char __user *user_buffer, size_t maxlen, unsigned long *num) { size_t i; *num = 0; for (i = 0; i < maxlen; i++) { char c; if (get_user(c, &user_buffer[i])) return -EFAULT; if ((c >= '0') && (c <= '9')) { *num *= 10; *num += c - '0'; } else break; } return i; } static ssize_t strn_len(const char __user *user_buffer, size_t maxlen) { size_t i; for (i = 0; i < maxlen; i++) { char c; if (get_user(c, &user_buffer[i])) return -EFAULT; switch (c) { case '\"': case '\n': case '\r': case '\t': case ' ': case '=': goto done_str; default: break; } } done_str: return i; } /* Parses imix entries from user buffer. * The user buffer should consist of imix entries separated by spaces * where each entry consists of size and weight delimited by commas. * "size1,weight_1 size2,weight_2 ... size_n,weight_n" for example. */ static ssize_t get_imix_entries(const char __user *buffer, size_t maxlen, struct pktgen_dev *pkt_dev) { size_t i = 0, max; ssize_t len; char c; pkt_dev->n_imix_entries = 0; do { unsigned long weight; unsigned long size; if (pkt_dev->n_imix_entries >= MAX_IMIX_ENTRIES) return -E2BIG; if (i >= maxlen) return -EINVAL; max = min(10, maxlen - i); len = num_arg(&buffer[i], max, &size); if (len < 0) return len; i += len; if (i >= maxlen) return -EINVAL; if (get_user(c, &buffer[i])) return -EFAULT; /* Check for comma between size_i and weight_i */ if (c != ',') return -EINVAL; i++; if (i >= maxlen) return -EINVAL; if (size < 14 + 20 + 8) size = 14 + 20 + 8; max = min(10, maxlen - i); len = num_arg(&buffer[i], max, &weight); if (len < 0) return len; if (weight <= 0) return -EINVAL; pkt_dev->imix_entries[pkt_dev->n_imix_entries].size = size; pkt_dev->imix_entries[pkt_dev->n_imix_entries].weight = weight; i += len; pkt_dev->n_imix_entries++; if (i >= maxlen) break; if (get_user(c, &buffer[i])) return -EFAULT; i++; } while (c == ' '); return i; } static ssize_t get_labels(const char __user *buffer, size_t maxlen, struct pktgen_dev *pkt_dev) { unsigned int n = 0; size_t i = 0, max; ssize_t len; char c; pkt_dev->nr_labels = 0; do { __u32 tmp; if (n >= MAX_MPLS_LABELS) return -E2BIG; if (i >= maxlen) return -EINVAL; max = min(8, maxlen - i); len = hex32_arg(&buffer[i], max, &tmp); if (len < 0) return len; /* return empty list in case of invalid input or zero value */ if (len == 0 || tmp == 0) return maxlen; pkt_dev->labels[n] = htonl(tmp); if (pkt_dev->labels[n] & MPLS_STACK_BOTTOM) pkt_dev->flags |= F_MPLS_RND; i += len; n++; if (i >= maxlen) break; if (get_user(c, &buffer[i])) return -EFAULT; i++; } while (c == ','); pkt_dev->nr_labels = n; return i; } static __u32 pktgen_read_flag(const char *f, bool *disable) { __u32 i; if (f[0] == '!') { *disable = true; f++; } for (i = 0; i < NR_PKT_FLAGS; i++) { if (!IS_ENABLED(CONFIG_XFRM) && i == IPSEC_SHIFT) continue; /* allow only disabling ipv6 flag */ if (!*disable && i == IPV6_SHIFT) continue; if (strcmp(f, pkt_flag_names[i]) == 0) return 1 << i; } if (strcmp(f, "FLOW_RND") == 0) { *disable = !*disable; return F_FLOW_SEQ; } return 0; } static ssize_t pktgen_if_write(struct file *file, const char __user *user_buffer, size_t count, loff_t *offset) { struct seq_file *seq = file->private_data; struct pktgen_dev *pkt_dev = seq->private; size_t i, max; ssize_t len; char name[16], valstr[32]; unsigned long value = 0; char *pg_result = NULL; char buf[128]; pg_result = &(pkt_dev->result[0]); if (count < 1) { pr_warn("wrong command format\n"); return -EINVAL; } max = count; len = count_trail_chars(user_buffer, max); if (len < 0) { pr_warn("illegal format\n"); return len; } i = len; /* Read variable name */ max = min(sizeof(name) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; memset(name, 0, sizeof(name)); if (copy_from_user(name, &user_buffer[i], len)) return -EFAULT; i += len; max = count - i; len = count_trail_chars(&user_buffer[i], max); if (len < 0) return len; i += len; if (debug) { size_t copy = min_t(size_t, count + 1, 1024); char *tp = strndup_user(user_buffer, copy); if (IS_ERR(tp)) return PTR_ERR(tp); pr_debug("%s,%zu buffer -:%s:-\n", name, count, tp); kfree(tp); } if (!strcmp(name, "min_pkt_size")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (value < 14 + 20 + 8) value = 14 + 20 + 8; if (value != pkt_dev->min_pkt_size) { pkt_dev->min_pkt_size = value; pkt_dev->cur_pkt_size = value; } sprintf(pg_result, "OK: min_pkt_size=%d", pkt_dev->min_pkt_size); return count; } if (!strcmp(name, "max_pkt_size")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (value < 14 + 20 + 8) value = 14 + 20 + 8; if (value != pkt_dev->max_pkt_size) { pkt_dev->max_pkt_size = value; pkt_dev->cur_pkt_size = value; } sprintf(pg_result, "OK: max_pkt_size=%d", pkt_dev->max_pkt_size); return count; } /* Shortcut for min = max */ if (!strcmp(name, "pkt_size")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (value < 14 + 20 + 8) value = 14 + 20 + 8; if (value != pkt_dev->min_pkt_size) { pkt_dev->min_pkt_size = value; pkt_dev->max_pkt_size = value; pkt_dev->cur_pkt_size = value; } sprintf(pg_result, "OK: pkt_size=%d", pkt_dev->min_pkt_size); return count; } if (!strcmp(name, "imix_weights")) { if (pkt_dev->clone_skb > 0) return -EINVAL; max = count - i; len = get_imix_entries(&user_buffer[i], max, pkt_dev); if (len < 0) return len; fill_imix_distribution(pkt_dev); return count; } if (!strcmp(name, "debug")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; debug = value; sprintf(pg_result, "OK: debug=%u", debug); return count; } if (!strcmp(name, "frags")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; pkt_dev->nfrags = value; sprintf(pg_result, "OK: frags=%d", pkt_dev->nfrags); return count; } if (!strcmp(name, "delay")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (value == 0x7FFFFFFF) pkt_dev->delay = ULLONG_MAX; else pkt_dev->delay = (u64)value; sprintf(pg_result, "OK: delay=%llu", (unsigned long long) pkt_dev->delay); return count; } if (!strcmp(name, "rate")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (!value) return -EINVAL; pkt_dev->delay = pkt_dev->min_pkt_size*8*NSEC_PER_USEC/value; if (debug) pr_info("Delay set at: %llu ns\n", pkt_dev->delay); sprintf(pg_result, "OK: rate=%lu", value); return count; } if (!strcmp(name, "ratep")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (!value) return -EINVAL; pkt_dev->delay = NSEC_PER_SEC/value; if (debug) pr_info("Delay set at: %llu ns\n", pkt_dev->delay); sprintf(pg_result, "OK: rate=%lu", value); return count; } if (!strcmp(name, "udp_src_min")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (value != pkt_dev->udp_src_min) { pkt_dev->udp_src_min = value; pkt_dev->cur_udp_src = value; } sprintf(pg_result, "OK: udp_src_min=%u", pkt_dev->udp_src_min); return count; } if (!strcmp(name, "udp_dst_min")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (value != pkt_dev->udp_dst_min) { pkt_dev->udp_dst_min = value; pkt_dev->cur_udp_dst = value; } sprintf(pg_result, "OK: udp_dst_min=%u", pkt_dev->udp_dst_min); return count; } if (!strcmp(name, "udp_src_max")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (value != pkt_dev->udp_src_max) { pkt_dev->udp_src_max = value; pkt_dev->cur_udp_src = value; } sprintf(pg_result, "OK: udp_src_max=%u", pkt_dev->udp_src_max); return count; } if (!strcmp(name, "udp_dst_max")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (value != pkt_dev->udp_dst_max) { pkt_dev->udp_dst_max = value; pkt_dev->cur_udp_dst = value; } sprintf(pg_result, "OK: udp_dst_max=%u", pkt_dev->udp_dst_max); return count; } if (!strcmp(name, "clone_skb")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; /* clone_skb is not supported for netif_receive xmit_mode and * IMIX mode. */ if ((value > 0) && ((pkt_dev->xmit_mode == M_NETIF_RECEIVE) || !(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING))) return -EOPNOTSUPP; if (value > 0 && (pkt_dev->n_imix_entries > 0 || !(pkt_dev->flags & F_SHARED))) return -EINVAL; pkt_dev->clone_skb = value; sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb); return count; } if (!strcmp(name, "count")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; pkt_dev->count = value; sprintf(pg_result, "OK: count=%llu", (unsigned long long)pkt_dev->count); return count; } if (!strcmp(name, "src_mac_count")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (pkt_dev->src_mac_count != value) { pkt_dev->src_mac_count = value; pkt_dev->cur_src_mac_offset = 0; } sprintf(pg_result, "OK: src_mac_count=%d", pkt_dev->src_mac_count); return count; } if (!strcmp(name, "dst_mac_count")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (pkt_dev->dst_mac_count != value) { pkt_dev->dst_mac_count = value; pkt_dev->cur_dst_mac_offset = 0; } sprintf(pg_result, "OK: dst_mac_count=%d", pkt_dev->dst_mac_count); return count; } if (!strcmp(name, "burst")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if ((value > 1) && ((pkt_dev->xmit_mode == M_QUEUE_XMIT) || ((pkt_dev->xmit_mode == M_START_XMIT) && (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING))))) return -EOPNOTSUPP; if (value > 1 && !(pkt_dev->flags & F_SHARED)) return -EINVAL; pkt_dev->burst = value < 1 ? 1 : value; sprintf(pg_result, "OK: burst=%u", pkt_dev->burst); return count; } if (!strcmp(name, "node")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (node_possible(value)) { pkt_dev->node = value; sprintf(pg_result, "OK: node=%d", pkt_dev->node); if (pkt_dev->page) { put_page(pkt_dev->page); pkt_dev->page = NULL; } } else { sprintf(pg_result, "ERROR: node not possible"); } return count; } if (!strcmp(name, "xmit_mode")) { char f[32]; max = min(sizeof(f) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; memset(f, 0, sizeof(f)); if (copy_from_user(f, &user_buffer[i], len)) return -EFAULT; if (strcmp(f, "start_xmit") == 0) { pkt_dev->xmit_mode = M_START_XMIT; } else if (strcmp(f, "netif_receive") == 0) { /* clone_skb set earlier, not supported in this mode */ if (pkt_dev->clone_skb > 0) return -EOPNOTSUPP; pkt_dev->xmit_mode = M_NETIF_RECEIVE; /* make sure new packet is allocated every time * pktgen_xmit() is called */ pkt_dev->last_ok = 1; } else if (strcmp(f, "queue_xmit") == 0) { pkt_dev->xmit_mode = M_QUEUE_XMIT; pkt_dev->last_ok = 1; } else { sprintf(pg_result, "xmit_mode -:%s:- unknown\nAvailable modes: %s", f, "start_xmit, netif_receive\n"); return count; } sprintf(pg_result, "OK: xmit_mode=%s", f); return count; } if (!strcmp(name, "flag")) { bool disable = false; __u32 flag; char f[32]; char *end; max = min(sizeof(f) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; memset(f, 0, 32); if (copy_from_user(f, &user_buffer[i], len)) return -EFAULT; flag = pktgen_read_flag(f, &disable); if (flag) { if (disable) { /* If "clone_skb", or "burst" parameters are * configured, it means that the skb still * needs to be referenced by the pktgen, so * the skb must be shared. */ if (flag == F_SHARED && (pkt_dev->clone_skb || pkt_dev->burst > 1)) return -EINVAL; pkt_dev->flags &= ~flag; } else { pkt_dev->flags |= flag; } sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags); return count; } /* Unknown flag */ end = pkt_dev->result + sizeof(pkt_dev->result); pg_result += sprintf(pg_result, "Flag -:%s:- unknown\n" "Available flags, (prepend ! to un-set flag):\n", f); for (int n = 0; n < NR_PKT_FLAGS && pg_result < end; n++) { if (!IS_ENABLED(CONFIG_XFRM) && n == IPSEC_SHIFT) continue; pg_result += snprintf(pg_result, end - pg_result, "%s, ", pkt_flag_names[n]); } if (!WARN_ON_ONCE(pg_result >= end)) { /* Remove the comma and whitespace at the end */ *(pg_result - 2) = '\0'; } return count; } if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) { max = min(sizeof(pkt_dev->dst_min) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; if (copy_from_user(buf, &user_buffer[i], len)) return -EFAULT; buf[len] = 0; if (strcmp(buf, pkt_dev->dst_min) != 0) { strscpy_pad(pkt_dev->dst_min, buf); pkt_dev->daddr_min = in_aton(pkt_dev->dst_min); pkt_dev->cur_daddr = pkt_dev->daddr_min; } if (debug) pr_debug("dst_min set to: %s\n", pkt_dev->dst_min); sprintf(pg_result, "OK: dst_min=%s", pkt_dev->dst_min); return count; } if (!strcmp(name, "dst_max")) { max = min(sizeof(pkt_dev->dst_max) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; if (copy_from_user(buf, &user_buffer[i], len)) return -EFAULT; buf[len] = 0; if (strcmp(buf, pkt_dev->dst_max) != 0) { strscpy_pad(pkt_dev->dst_max, buf); pkt_dev->daddr_max = in_aton(pkt_dev->dst_max); pkt_dev->cur_daddr = pkt_dev->daddr_max; } if (debug) pr_debug("dst_max set to: %s\n", pkt_dev->dst_max); sprintf(pg_result, "OK: dst_max=%s", pkt_dev->dst_max); return count; } if (!strcmp(name, "dst6")) { max = min(sizeof(buf) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; pkt_dev->flags |= F_IPV6; if (copy_from_user(buf, &user_buffer[i], len)) return -EFAULT; buf[len] = 0; in6_pton(buf, -1, pkt_dev->in6_daddr.s6_addr, -1, NULL); snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_daddr); pkt_dev->cur_in6_daddr = pkt_dev->in6_daddr; if (debug) pr_debug("dst6 set to: %s\n", buf); sprintf(pg_result, "OK: dst6=%s", buf); return count; } if (!strcmp(name, "dst6_min")) { max = min(sizeof(buf) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; pkt_dev->flags |= F_IPV6; if (copy_from_user(buf, &user_buffer[i], len)) return -EFAULT; buf[len] = 0; in6_pton(buf, -1, pkt_dev->min_in6_daddr.s6_addr, -1, NULL); snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->min_in6_daddr); pkt_dev->cur_in6_daddr = pkt_dev->min_in6_daddr; if (debug) pr_debug("dst6_min set to: %s\n", buf); sprintf(pg_result, "OK: dst6_min=%s", buf); return count; } if (!strcmp(name, "dst6_max")) { max = min(sizeof(buf) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; pkt_dev->flags |= F_IPV6; if (copy_from_user(buf, &user_buffer[i], len)) return -EFAULT; buf[len] = 0; in6_pton(buf, -1, pkt_dev->max_in6_daddr.s6_addr, -1, NULL); snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->max_in6_daddr); if (debug) pr_debug("dst6_max set to: %s\n", buf); sprintf(pg_result, "OK: dst6_max=%s", buf); return count; } if (!strcmp(name, "src6")) { max = min(sizeof(buf) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; pkt_dev->flags |= F_IPV6; if (copy_from_user(buf, &user_buffer[i], len)) return -EFAULT; buf[len] = 0; in6_pton(buf, -1, pkt_dev->in6_saddr.s6_addr, -1, NULL); snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_saddr); pkt_dev->cur_in6_saddr = pkt_dev->in6_saddr; if (debug) pr_debug("src6 set to: %s\n", buf); sprintf(pg_result, "OK: src6=%s", buf); return count; } if (!strcmp(name, "src_min")) { max = min(sizeof(pkt_dev->src_min) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; if (copy_from_user(buf, &user_buffer[i], len)) return -EFAULT; buf[len] = 0; if (strcmp(buf, pkt_dev->src_min) != 0) { strscpy_pad(pkt_dev->src_min, buf); pkt_dev->saddr_min = in_aton(pkt_dev->src_min); pkt_dev->cur_saddr = pkt_dev->saddr_min; } if (debug) pr_debug("src_min set to: %s\n", pkt_dev->src_min); sprintf(pg_result, "OK: src_min=%s", pkt_dev->src_min); return count; } if (!strcmp(name, "src_max")) { max = min(sizeof(pkt_dev->src_max) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; if (copy_from_user(buf, &user_buffer[i], len)) return -EFAULT; buf[len] = 0; if (strcmp(buf, pkt_dev->src_max) != 0) { strscpy_pad(pkt_dev->src_max, buf); pkt_dev->saddr_max = in_aton(pkt_dev->src_max); pkt_dev->cur_saddr = pkt_dev->saddr_max; } if (debug) pr_debug("src_max set to: %s\n", pkt_dev->src_max); sprintf(pg_result, "OK: src_max=%s", pkt_dev->src_max); return count; } if (!strcmp(name, "dst_mac")) { max = min(sizeof(valstr) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; memset(valstr, 0, sizeof(valstr)); if (copy_from_user(valstr, &user_buffer[i], len)) return -EFAULT; if (!mac_pton(valstr, pkt_dev->dst_mac)) return -EINVAL; /* Set up Dest MAC */ ether_addr_copy(&pkt_dev->hh[0], pkt_dev->dst_mac); sprintf(pg_result, "OK: dstmac %pM", pkt_dev->dst_mac); return count; } if (!strcmp(name, "src_mac")) { max = min(sizeof(valstr) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; memset(valstr, 0, sizeof(valstr)); if (copy_from_user(valstr, &user_buffer[i], len)) return -EFAULT; if (!mac_pton(valstr, pkt_dev->src_mac)) return -EINVAL; /* Set up Src MAC */ ether_addr_copy(&pkt_dev->hh[6], pkt_dev->src_mac); sprintf(pg_result, "OK: srcmac %pM", pkt_dev->src_mac); return count; } if (!strcmp(name, "clear_counters")) { pktgen_clear_counters(pkt_dev); sprintf(pg_result, "OK: Clearing counters.\n"); return count; } if (!strcmp(name, "flows")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (value > MAX_CFLOWS) value = MAX_CFLOWS; pkt_dev->cflows = value; sprintf(pg_result, "OK: flows=%u", pkt_dev->cflows); return count; } #ifdef CONFIG_XFRM if (!strcmp(name, "spi")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; pkt_dev->spi = value; sprintf(pg_result, "OK: spi=%u", pkt_dev->spi); return count; } #endif if (!strcmp(name, "flowlen")) { max = min(10, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; pkt_dev->lflow = value; sprintf(pg_result, "OK: flowlen=%u", pkt_dev->lflow); return count; } if (!strcmp(name, "queue_map_min")) { max = min(5, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; pkt_dev->queue_map_min = value; sprintf(pg_result, "OK: queue_map_min=%u", pkt_dev->queue_map_min); return count; } if (!strcmp(name, "queue_map_max")) { max = min(5, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; pkt_dev->queue_map_max = value; sprintf(pg_result, "OK: queue_map_max=%u", pkt_dev->queue_map_max); return count; } if (!strcmp(name, "mpls")) { unsigned int n, cnt; max = count - i; len = get_labels(&user_buffer[i], max, pkt_dev); if (len < 0) return len; cnt = sprintf(pg_result, "OK: mpls="); for (n = 0; n < pkt_dev->nr_labels; n++) cnt += sprintf(pg_result + cnt, "%08x%s", ntohl(pkt_dev->labels[n]), n == pkt_dev->nr_labels-1 ? "" : ","); if (pkt_dev->nr_labels && pkt_dev->vlan_id != 0xffff) { pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */ pkt_dev->svlan_id = 0xffff; if (debug) pr_debug("VLAN/SVLAN auto turned off\n"); } return count; } if (!strcmp(name, "vlan_id")) { max = min(4, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if (value <= 4095) { pkt_dev->vlan_id = value; /* turn on VLAN */ if (debug) pr_debug("VLAN turned on\n"); if (debug && pkt_dev->nr_labels) pr_debug("MPLS auto turned off\n"); pkt_dev->nr_labels = 0; /* turn off MPLS */ sprintf(pg_result, "OK: vlan_id=%u", pkt_dev->vlan_id); } else { pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */ pkt_dev->svlan_id = 0xffff; if (debug) pr_debug("VLAN/SVLAN turned off\n"); } return count; } if (!strcmp(name, "vlan_p")) { max = min(1, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if ((value <= 7) && (pkt_dev->vlan_id != 0xffff)) { pkt_dev->vlan_p = value; sprintf(pg_result, "OK: vlan_p=%u", pkt_dev->vlan_p); } else { sprintf(pg_result, "ERROR: vlan_p must be 0-7"); } return count; } if (!strcmp(name, "vlan_cfi")) { max = min(1, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if ((value <= 1) && (pkt_dev->vlan_id != 0xffff)) { pkt_dev->vlan_cfi = value; sprintf(pg_result, "OK: vlan_cfi=%u", pkt_dev->vlan_cfi); } else { sprintf(pg_result, "ERROR: vlan_cfi must be 0-1"); } return count; } if (!strcmp(name, "svlan_id")) { max = min(4, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if ((value <= 4095) && ((pkt_dev->vlan_id != 0xffff))) { pkt_dev->svlan_id = value; /* turn on SVLAN */ if (debug) pr_debug("SVLAN turned on\n"); if (debug && pkt_dev->nr_labels) pr_debug("MPLS auto turned off\n"); pkt_dev->nr_labels = 0; /* turn off MPLS */ sprintf(pg_result, "OK: svlan_id=%u", pkt_dev->svlan_id); } else { pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */ pkt_dev->svlan_id = 0xffff; if (debug) pr_debug("VLAN/SVLAN turned off\n"); } return count; } if (!strcmp(name, "svlan_p")) { max = min(1, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if ((value <= 7) && (pkt_dev->svlan_id != 0xffff)) { pkt_dev->svlan_p = value; sprintf(pg_result, "OK: svlan_p=%u", pkt_dev->svlan_p); } else { sprintf(pg_result, "ERROR: svlan_p must be 0-7"); } return count; } if (!strcmp(name, "svlan_cfi")) { max = min(1, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; if ((value <= 1) && (pkt_dev->svlan_id != 0xffff)) { pkt_dev->svlan_cfi = value; sprintf(pg_result, "OK: svlan_cfi=%u", pkt_dev->svlan_cfi); } else { sprintf(pg_result, "ERROR: svlan_cfi must be 0-1"); } return count; } if (!strcmp(name, "tos")) { __u32 tmp_value; max = min(2, count - i); len = hex32_arg(&user_buffer[i], max, &tmp_value); if (len < 0) return len; if (len == 2) { pkt_dev->tos = tmp_value; sprintf(pg_result, "OK: tos=0x%02x", pkt_dev->tos); } else { sprintf(pg_result, "ERROR: tos must be 00-ff"); } return count; } if (!strcmp(name, "traffic_class")) { __u32 tmp_value; max = min(2, count - i); len = hex32_arg(&user_buffer[i], max, &tmp_value); if (len < 0) return len; if (len == 2) { pkt_dev->traffic_class = tmp_value; sprintf(pg_result, "OK: traffic_class=0x%02x", pkt_dev->traffic_class); } else { sprintf(pg_result, "ERROR: traffic_class must be 00-ff"); } return count; } if (!strcmp(name, "skb_priority")) { max = min(9, count - i); len = num_arg(&user_buffer[i], max, &value); if (len < 0) return len; pkt_dev->skb_priority = value; sprintf(pg_result, "OK: skb_priority=%i", pkt_dev->skb_priority); return count; } sprintf(pkt_dev->result, "No such parameter \"%s\"", name); return -EINVAL; } static int pktgen_if_open(struct inode *inode, struct file *file) { return single_open(file, pktgen_if_show, pde_data(inode)); } static const struct proc_ops pktgen_if_proc_ops = { .proc_open = pktgen_if_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_write = pktgen_if_write, .proc_release = single_release, }; static int pktgen_thread_show(struct seq_file *seq, void *v) { struct pktgen_thread *t = seq->private; const struct pktgen_dev *pkt_dev; BUG_ON(!t); seq_puts(seq, "Running: "); rcu_read_lock(); list_for_each_entry_rcu(pkt_dev, &t->if_list, list) if (pkt_dev->running) seq_printf(seq, "%s ", pkt_dev->odevname); seq_puts(seq, "\nStopped: "); list_for_each_entry_rcu(pkt_dev, &t->if_list, list) if (!pkt_dev->running) seq_printf(seq, "%s ", pkt_dev->odevname); if (t->result[0]) seq_printf(seq, "\nResult: %s\n", t->result); else seq_puts(seq, "\nResult: NA\n"); rcu_read_unlock(); return 0; } static ssize_t pktgen_thread_write(struct file *file, const char __user *user_buffer, size_t count, loff_t *offset) { struct seq_file *seq = file->private_data; struct pktgen_thread *t = seq->private; size_t i, max; ssize_t len, ret; char name[40]; char *pg_result; if (count < 1) { // sprintf(pg_result, "Wrong command format"); return -EINVAL; } max = count; len = count_trail_chars(user_buffer, max); if (len < 0) return len; i = len; /* Read variable name */ max = min(sizeof(name) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) return len; memset(name, 0, sizeof(name)); if (copy_from_user(name, &user_buffer[i], len)) return -EFAULT; i += len; max = count - i; len = count_trail_chars(&user_buffer[i], max); if (len < 0) return len; i += len; if (debug) pr_debug("t=%s, count=%lu\n", name, (unsigned long)count); if (!t) { pr_err("ERROR: No thread\n"); ret = -EINVAL; goto out; } pg_result = &(t->result[0]); if (!strcmp(name, "add_device")) { char f[32]; memset(f, 0, 32); max = min(sizeof(f) - 1, count - i); len = strn_len(&user_buffer[i], max); if (len < 0) { ret = len; goto out; } if (copy_from_user(f, &user_buffer[i], len)) return -EFAULT; mutex_lock(&pktgen_thread_lock); ret = pktgen_add_device(t, f); mutex_unlock(&pktgen_thread_lock); if (!ret) { ret = count; sprintf(pg_result, "OK: add_device=%s", f); } else sprintf(pg_result, "ERROR: can not add device %s", f); goto out; } if (!strcmp(name, "rem_device_all")) { mutex_lock(&pktgen_thread_lock); t->control |= T_REMDEVALL; mutex_unlock(&pktgen_thread_lock); schedule_timeout_interruptible(msecs_to_jiffies(125)); /* Propagate thread->control * ret = count; sprintf(pg_result, "OK: rem_device_all"); goto out; } if (!strcmp(name, "max_before_softirq")) { sprintf(pg_result, "OK: Note! max_before_softirq is obsoleted -- Do not use"); ret = count; goto out; } ret = -EINVAL; out: return ret; } static int pktgen_thread_open(struct inode *inode, struct file *file) { return single_open(file, pktgen_thread_show, pde_data(inode)); } static const struct proc_ops pktgen_thread_proc_ops = { .proc_open = pktgen_thread_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_write = pktgen_thread_write, .proc_release = single_release, }; /* Think find or remove for NN */ static struct pktgen_dev *__pktgen_NN_threads(const struct pktgen_net *pn, const char *ifname, int remove) { struct pktgen_thread *t; struct pktgen_dev *pkt_dev = NULL; bool exact = (remove == FIND); list_for_each_entry(t, &pn->pktgen_threads, th_list) { pkt_dev = pktgen_find_dev(t, ifname, exact); if (pkt_dev) { if (remove) { pkt_dev->removal_mark = 1; t->control |= T_REMDEV; } break; } } return pkt_dev; } /* * mark a device for removal */ static void pktgen_mark_device(const struct pktgen_net *pn, const char *ifname) { struct pktgen_dev *pkt_dev = NULL; const int max_tries = 10, msec_per_try = 125; int i = 0; mutex_lock(&pktgen_thread_lock); pr_debug("%s: marking %s for removal\n", __func__, ifname); while (1) { pkt_dev = __pktgen_NN_threads(pn, ifname, REMOVE); if (pkt_dev == NULL) break; /* success */ mutex_unlock(&pktgen_thread_lock); pr_debug("%s: waiting for %s to disappear....\n", __func__, ifname); schedule_timeout_interruptible(msecs_to_jiffies(msec_per_try)); mutex_lock(&pktgen_thread_lock); if (++i >= max_tries) { pr_err("%s: timed out after waiting %d msec for device %s to be removed\n", __func__, msec_per_try * i, ifname); break; } } mutex_unlock(&pktgen_thread_lock); } static void pktgen_change_name(const struct pktgen_net *pn, struct net_device *dev) { struct pktgen_thread *t; mutex_lock(&pktgen_thread_lock); list_for_each_entry(t, &pn->pktgen_threads, th_list) { struct pktgen_dev *pkt_dev; if_lock(t); list_for_each_entry(pkt_dev, &t->if_list, list) { if (pkt_dev->odev != dev) continue; proc_remove(pkt_dev->entry); pkt_dev->entry = proc_create_data(dev->name, 0600, pn->proc_dir, &pktgen_if_proc_ops, pkt_dev); if (!pkt_dev->entry) pr_err("can't move proc entry for '%s'\n", dev->name); break; } if_unlock(t); } mutex_unlock(&pktgen_thread_lock); } static int pktgen_device_event(struct notifier_block *unused, unsigned long event, void *ptr) { struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct pktgen_net *pn = net_generic(dev_net(dev), pg_net_id); if (pn->pktgen_exiting) return NOTIFY_DONE; /* It is OK that we do not hold the group lock right now, * as we run under the RTNL lock. */ switch (event) { case NETDEV_CHANGENAME: pktgen_change_name(pn, dev); break; case NETDEV_UNREGISTER: pktgen_mark_device(pn, dev->name); break; } return NOTIFY_DONE; } static struct net_device *pktgen_dev_get_by_name(const struct pktgen_net *pn, struct pktgen_dev *pkt_dev, const char *ifname) { char b[IFNAMSIZ+5]; int i; for (i = 0; ifname[i] != '@'; i++) { if (i == IFNAMSIZ) break; b[i] = ifname[i]; } b[i] = 0; return dev_get_by_name(pn->net, b); } /* Associate pktgen_dev with a device. */ static int pktgen_setup_dev(const struct pktgen_net *pn, struct pktgen_dev *pkt_dev, const char *ifname) { struct net_device *odev; int err; /* Clean old setups */ if (pkt_dev->odev) { netdev_put(pkt_dev->odev, &pkt_dev->dev_tracker); pkt_dev->odev = NULL; } odev = pktgen_dev_get_by_name(pn, pkt_dev, ifname); if (!odev) { pr_err("no such netdevice: \"%s\"\n", ifname); return -ENODEV; } if (odev->type != ARPHRD_ETHER && odev->type != ARPHRD_LOOPBACK) { pr_err("not an ethernet or loopback device: \"%s\"\n", ifname); err = -EINVAL; } else if (!netif_running(odev)) { pr_err("device is down: \"%s\"\n", ifname); err = -ENETDOWN; } else { pkt_dev->odev = odev; netdev_tracker_alloc(odev, &pkt_dev->dev_tracker, GFP_KERNEL); return 0; } dev_put(odev); return err; } /* Read pkt_dev from the interface and set up internal pktgen_dev * structure to have the right information to create/send packets */ static void pktgen_setup_inject(struct pktgen_dev *pkt_dev) { int ntxq; if (!pkt_dev->odev) { pr_err("ERROR: pkt_dev->odev == NULL in setup_inject\n"); sprintf(pkt_dev->result, "ERROR: pkt_dev->odev == NULL in setup_inject.\n"); return; } /* make sure that we don't pick a non-existing transmit queue */ ntxq = pkt_dev->odev->real_num_tx_queues; if (ntxq <= pkt_dev->queue_map_min) { pr_warn("WARNING: Requested queue_map_min (zero-based) (%d) exceeds valid range [0 - %d] fo pkt_dev->queue_map_min, (ntxq ?: 1) - 1, ntxq, pkt_dev->odevname); pkt_dev->queue_map_min = (ntxq ?: 1) - 1; } if (pkt_dev->queue_map_max >= ntxq) { pr_warn("WARNING: Requested queue_map_max (zero-based) (%d) exceeds valid range [0 - %d] fo pkt_dev->queue_map_max, (ntxq ?: 1) - 1, ntxq, pkt_dev->odevname); pkt_dev->queue_map_max = (ntxq ?: 1) - 1; } /* Default to the interface's mac if not explicitly set. */ if (is_zero_ether_addr(pkt_dev->src_mac)) ether_addr_copy(&(pkt_dev->hh[6]), pkt_dev->odev->dev_addr); /* Set up Dest MAC */ ether_addr_copy(&(pkt_dev->hh[0]), pkt_dev->dst_mac); if (pkt_dev->flags & F_IPV6) { int i, set = 0, err = 1; struct inet6_dev *idev; if (pkt_dev->min_pkt_size == 0) { pkt_dev->min_pkt_size = 14 + sizeof(struct ipv6hdr) + sizeof(struct udphdr) + sizeof(struct pktgen_hdr) + pkt_dev->pkt_overhead; } for (i = 0; i < sizeof(struct in6_addr); i++) if (pkt_dev->cur_in6_saddr.s6_addr[i]) { set = 1; break; } if (!set) { /* * Use linklevel address if unconfigured. * * use ipv6_get_lladdr if/when it's get exported */ rcu_read_lock(); idev = __in6_dev_get(pkt_dev->odev); if (idev) { struct inet6_ifaddr *ifp; read_lock_bh(&idev->lock); list_for_each_entry(ifp, &idev->addr_list, if_list) { if ((ifp->scope & IFA_LINK) && !(ifp->flags & IFA_F_TENTATIVE)) { pkt_dev->cur_in6_saddr = ifp->addr; err = 0; break; } } read_unlock_bh(&idev->lock); } rcu_read_unlock(); if (err) pr_err("ERROR: IPv6 link address not available\n"); } } else { if (pkt_dev->min_pkt_size == 0) { pkt_dev->min_pkt_size = 14 + sizeof(struct iphdr) + sizeof(struct udphdr) + sizeof(struct pktgen_hdr) + pkt_dev->pkt_overhead; } pkt_dev->saddr_min = 0; pkt_dev->saddr_max = 0; if (strlen(pkt_dev->src_min) == 0) { struct in_device *in_dev; rcu_read_lock(); in_dev = __in_dev_get_rcu(pkt_dev->odev); if (in_dev) { const struct in_ifaddr *ifa; ifa = rcu_dereference(in_dev->ifa_list); if (ifa) { pkt_dev->saddr_min = ifa->ifa_address; pkt_dev->saddr_max = pkt_dev->saddr_min; } } rcu_read_unlock(); } else { pkt_dev->saddr_min = in_aton(pkt_dev->src_min); pkt_dev->saddr_max = in_aton(pkt_dev->src_max); } pkt_dev->daddr_min = in_aton(pkt_dev->dst_min); pkt_dev->daddr_max = in_aton(pkt_dev->dst_max); } /* Initialize current values. */ pkt_dev->cur_pkt_size = pkt_dev->min_pkt_size; if (pkt_dev->min_pkt_size > pkt_dev->max_pkt_size) pkt_dev->max_pkt_size = pkt_dev->min_pkt_size; pkt_dev->cur_dst_mac_offset = 0; pkt_dev->cur_src_mac_offset = 0; pkt_dev->cur_saddr = pkt_dev->saddr_min; pkt_dev->cur_daddr = pkt_dev->daddr_min; pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min; pkt_dev->cur_udp_src = pkt_dev->udp_src_min; pkt_dev->nflows = 0; } static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until) { ktime_t start_time, end_time; s64 remaining; struct hrtimer_sleeper t; hrtimer_setup_sleeper_on_stack(&t, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); hrtimer_set_expires(&t.timer, spin_until); remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer)); if (remaining <= 0) goto out; start_time = ktime_get(); if (remaining < 100000) { /* for small delays (<100us), just loop until limit is reached */ do { end_time = ktime_get(); } while (ktime_compare(end_time, spin_until) < 0); } else { do { set_current_state(TASK_INTERRUPTIBLE); hrtimer_sleeper_start_expires(&t, HRTIMER_MODE_ABS); if (likely(t.task)) schedule(); hrtimer_cancel(&t.timer); } while (t.task && pkt_dev->running && !signal_pending(current)); __set_current_state(TASK_RUNNING); end_time = ktime_get(); } pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time, start_time)); out: pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay); destroy_hrtimer_on_stack(&t.timer); } static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev) { pkt_dev->pkt_overhead = 0; pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32); pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev); pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev); } static inline int f_seen(const struct pktgen_dev *pkt_dev, int flow) { return !!(pkt_dev->flows[flow].flags & F_INIT); } static inline int f_pick(struct pktgen_dev *pkt_dev) { int flow = pkt_dev->curfl; if (pkt_dev->flags & F_FLOW_SEQ) { if (pkt_dev->flows[flow].count >= pkt_dev->lflow) { /* reset time */ pkt_dev->flows[flow].count = 0; pkt_dev->flows[flow].flags = 0; pkt_dev->curfl += 1; if (pkt_dev->curfl >= pkt_dev->cflows) pkt_dev->curfl = 0; /*reset */ } } else { flow = get_random_u32_below(pkt_dev->cflows); pkt_dev->curfl = flow; if (pkt_dev->flows[flow].count > pkt_dev->lflow) { pkt_dev->flows[flow].count = 0; pkt_dev->flows[flow].flags = 0; } } return pkt_dev->curfl; } /* If there was already an IPSEC SA, we keep it as is, else * we go look for it ... */ #define DUMMY_MARK 0 static void get_ipsec_sa(struct pktgen_dev *pkt_dev, int flow) { #ifdef CONFIG_XFRM struct xfrm_state *x = pkt_dev->flows[flow].x; struct pktgen_net *pn = net_generic(dev_net(pkt_dev->odev), pg_net_id); if (!x) { if (pkt_dev->spi) { /* We need as quick as possible to find the right SA * Searching with minimum criteria to achieve, this. */ x = xfrm_state_lookup_byspi(pn->net, htonl(pkt_dev->spi), AF_INET); } else { /* slow path: we don't already have xfrm_state */ x = xfrm_stateonly_find(pn->net, DUMMY_MARK, 0, (xfrm_address_t *)&pkt_dev->cur_daddr, (xfrm_address_t *)&pkt_dev->cur_saddr, AF_INET, pkt_dev->ipsmode, pkt_dev->ipsproto, 0); } if (x) { pkt_dev->flows[flow].x = x; set_pkt_overhead(pkt_dev); pkt_dev->pkt_overhead += x->props.header_len; } } #endif } static void set_cur_queue_map(struct pktgen_dev *pkt_dev) { if (pkt_dev->flags & F_QUEUE_MAP_CPU) pkt_dev->cur_queue_map = smp_processor_id(); else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) { __u16 t; if (pkt_dev->flags & F_QUEUE_MAP_RND) { t = get_random_u32_inclusive(pkt_dev->queue_map_min, pkt_dev->queue_map_max); } else { t = pkt_dev->cur_queue_map + 1; if (t > pkt_dev->queue_map_max) t = pkt_dev->queue_map_min; } pkt_dev->cur_queue_map = t; } pkt_dev->cur_queue_map = pkt_dev->cur_queue_map % pkt_dev->odev->real_num_tx_queues; } /* Increment/randomize headers according to flags and current values * for IP src/dest, UDP src/dst port, MAC-Addr src/dst */ static void mod_cur_headers(struct pktgen_dev *pkt_dev) { __u32 imn; __u32 imx; int flow = 0; if (pkt_dev->cflows) flow = f_pick(pkt_dev); /* Deal with source MAC */ if (pkt_dev->src_mac_count > 1) { __u32 mc; __u32 tmp; if (pkt_dev->flags & F_MACSRC_RND) mc = get_random_u32_below(pkt_dev->src_mac_count); else { mc = pkt_dev->cur_src_mac_offset++; if (pkt_dev->cur_src_mac_offset >= pkt_dev->src_mac_count) pkt_dev->cur_src_mac_offset = 0; } tmp = pkt_dev->src_mac[5] + (mc & 0xFF); pkt_dev->hh[11] = tmp; tmp = (pkt_dev->src_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8)); pkt_dev->hh[10] = tmp; tmp = (pkt_dev->src_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8)); pkt_dev->hh[9] = tmp; tmp = (pkt_dev->src_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8)); pkt_dev->hh[8] = tmp; tmp = (pkt_dev->src_mac[1] + (tmp >> 8)); pkt_dev->hh[7] = tmp; } /* Deal with Destination MAC */ if (pkt_dev->dst_mac_count > 1) { __u32 mc; __u32 tmp; if (pkt_dev->flags & F_MACDST_RND) mc = get_random_u32_below(pkt_dev->dst_mac_count); else { mc = pkt_dev->cur_dst_mac_offset++; if (pkt_dev->cur_dst_mac_offset >= pkt_dev->dst_mac_count) { pkt_dev->cur_dst_mac_offset = 0; } } tmp = pkt_dev->dst_mac[5] + (mc & 0xFF); pkt_dev->hh[5] = tmp; tmp = (pkt_dev->dst_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8)); pkt_dev->hh[4] = tmp; tmp = (pkt_dev->dst_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8)); pkt_dev->hh[3] = tmp; tmp = (pkt_dev->dst_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8)); pkt_dev->hh[2] = tmp; tmp = (pkt_dev->dst_mac[1] + (tmp >> 8)); pkt_dev->hh[1] = tmp; } if (pkt_dev->flags & F_MPLS_RND) { unsigned int i; for (i = 0; i < pkt_dev->nr_labels; i++) if (pkt_dev->labels[i] & MPLS_STACK_BOTTOM) pkt_dev->labels[i] = MPLS_STACK_BOTTOM | ((__force __be32)get_random_u32() & htonl(0x000fffff)); } if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) { pkt_dev->vlan_id = get_random_u32_below(4096); } if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) { pkt_dev->svlan_id = get_random_u32_below(4096); } if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) { if (pkt_dev->flags & F_UDPSRC_RND) pkt_dev->cur_udp_src = get_random_u32_inclusive(pkt_dev->udp_src_min, pkt_dev->udp_src_max - 1); else { pkt_dev->cur_udp_src++; if (pkt_dev->cur_udp_src >= pkt_dev->udp_src_max) pkt_dev->cur_udp_src = pkt_dev->udp_src_min; } } if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) { if (pkt_dev->flags & F_UDPDST_RND) { pkt_dev->cur_udp_dst = get_random_u32_inclusive(pkt_dev->udp_dst_min, pkt_dev->udp_dst_max - 1); } else { pkt_dev->cur_udp_dst++; if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max) pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min; } } if (!(pkt_dev->flags & F_IPV6)) { imn = ntohl(pkt_dev->saddr_min); imx = ntohl(pkt_dev->saddr_max); if (imn < imx) { __u32 t; if (pkt_dev->flags & F_IPSRC_RND) t = get_random_u32_inclusive(imn, imx - 1); else { t = ntohl(pkt_dev->cur_saddr); t++; if (t > imx) t = imn; } pkt_dev->cur_saddr = htonl(t); } if (pkt_dev->cflows && f_seen(pkt_dev, flow)) { pkt_dev->cur_daddr = pkt_dev->flows[flow].cur_daddr; } else { imn = ntohl(pkt_dev->daddr_min); imx = ntohl(pkt_dev->daddr_max); if (imn < imx) { __u32 t; __be32 s; if (pkt_dev->flags & F_IPDST_RND) { do { t = get_random_u32_inclusive(imn, imx - 1); s = htonl(t); } while (ipv4_is_loopback(s) || ipv4_is_multicast(s) || ipv4_is_lbcast(s) || ipv4_is_zeronet(s) || ipv4_is_local_multicast(s)); pkt_dev->cur_daddr = s; } else { t = ntohl(pkt_dev->cur_daddr); t++; if (t > imx) { t = imn; } pkt_dev->cur_daddr = htonl(t); } } if (pkt_dev->cflows) { pkt_dev->flows[flow].flags |= F_INIT; pkt_dev->flows[flow].cur_daddr = pkt_dev->cur_daddr; if (pkt_dev->flags & F_IPSEC) get_ipsec_sa(pkt_dev, flow); pkt_dev->nflows++; } } } else { /* IPV6 * */ if (!ipv6_addr_any(&pkt_dev->min_in6_daddr)) { int i; /* Only random destinations yet */ for (i = 0; i < 4; i++) { pkt_dev->cur_in6_daddr.s6_addr32[i] = (((__force __be32)get_random_u32() | pkt_dev->min_in6_daddr.s6_addr32[i]) & pkt_dev->max_in6_daddr.s6_addr32[i]); } } } if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) { __u32 t; if (pkt_dev->flags & F_TXSIZE_RND) { t = get_random_u32_inclusive(pkt_dev->min_pkt_size, pkt_dev->max_pkt_size - 1); } else { t = pkt_dev->cur_pkt_size + 1; if (t > pkt_dev->max_pkt_size) t = pkt_dev->min_pkt_size; } pkt_dev->cur_pkt_size = t; } else if (pkt_dev->n_imix_entries > 0) { struct imix_pkt *entry; __u32 t = get_random_u32_below(IMIX_PRECISION); __u8 entry_index = pkt_dev->imix_distribution[t]; entry = &pkt_dev->imix_entries[entry_index]; entry->count_so_far++; pkt_dev->cur_pkt_size = entry->size; } set_cur_queue_map(pkt_dev); pkt_dev->flows[flow].count++; } static void fill_imix_distribution(struct pktgen_dev *pkt_dev) { int cumulative_probabilites[MAX_IMIX_ENTRIES]; int j = 0; __u64 cumulative_prob = 0; __u64 total_weight = 0; int i = 0; for (i = 0; i < pkt_dev->n_imix_entries; i++) total_weight += pkt_dev->imix_entries[i].weight; /* Fill cumulative_probabilites with sum of normalized probabilities */ for (i = 0; i < pkt_dev->n_imix_entries - 1; i++) { cumulative_prob += div64_u64(pkt_dev->imix_entries[i].weight * IMIX_PRECISION, total_weight); cumulative_probabilites[i] = cumulative_prob; } cumulative_probabilites[pkt_dev->n_imix_entries - 1] = 100; for (i = 0; i < IMIX_PRECISION; i++) { if (i == cumulative_probabilites[j]) j++; pkt_dev->imix_distribution[i] = j; } } #ifdef CONFIG_XFRM static u32 pktgen_dst_metrics[RTAX_MAX + 1] = { [RTAX_HOPLIMIT] = 0x5, /* Set a static hoplimit */ }; static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev) { struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x; int err = 0; struct net *net = dev_net(pkt_dev->odev); if (!x) return 0; /* XXX: we dont support tunnel mode for now until * we resolve the dst issue */ if ((x->props.mode != XFRM_MODE_TRANSPORT) && (pkt_dev->spi == 0)) return 0; /* But when user specify an valid SPI, transformation * supports both transport/tunnel mode + ESP/AH type. */ if ((x->props.mode == XFRM_MODE_TUNNEL) && (pkt_dev->spi != 0)) skb->_skb_refdst = (unsigned long)&pkt_dev->xdst.u.dst | SKB_DST_NOREF; rcu_read_lock_bh(); err = pktgen_xfrm_outer_mode_output(x, skb); rcu_read_unlock_bh(); if (err) { XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR); goto error; } err = x->type->output(x, skb); if (err) { XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR); goto error; } spin_lock_bh(&x->lock); x->curlft.bytes += skb->len; x->curlft.packets++; spin_unlock_bh(&x->lock); error: return err; } static void free_SAs(struct pktgen_dev *pkt_dev) { if (pkt_dev->cflows) { /* let go of the SAs if we have them */ int i; for (i = 0; i < pkt_dev->cflows; i++) { struct xfrm_state *x = pkt_dev->flows[i].x; if (x) { xfrm_state_put(x); pkt_dev->flows[i].x = NULL; } } } } static int process_ipsec(struct pktgen_dev *pkt_dev, struct sk_buff *skb, __be16 protocol) { if (pkt_dev->flags & F_IPSEC) { struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x; int nhead = 0; if (x) { struct ethhdr *eth; struct iphdr *iph; int ret; nhead = x->props.header_len - skb_headroom(skb); if (nhead > 0) { ret = pskb_expand_head(skb, nhead, 0, GFP_ATOMIC); if (ret < 0) { pr_err("Error expanding ipsec packet %d\n", ret); goto err; } } /* ipsec is not expecting ll header */ skb_pull(skb, ETH_HLEN); ret = pktgen_output_ipsec(skb, pkt_dev); if (ret) { pr_err("Error creating ipsec packet %d\n", ret); goto err; } /* restore ll */ eth = skb_push(skb, ETH_HLEN); memcpy(eth, pkt_dev->hh, 2 * ETH_ALEN); eth->h_proto = protocol; /* Update IPv4 header len as well as checksum value */ iph = ip_hdr(skb); iph->tot_len = htons(skb->len - ETH_HLEN); ip_send_check(iph); } } return 1; err: kfree_skb(skb); return 0; } #endif static void mpls_push(__be32 *mpls, struct pktgen_dev *pkt_dev) { unsigned int i; for (i = 0; i < pkt_dev->nr_labels; i++) *mpls++ = pkt_dev->labels[i] & ~MPLS_STACK_BOTTOM; mpls--; *mpls |= MPLS_STACK_BOTTOM; } static inline __be16 build_tci(unsigned int id, unsigned int cfi, unsigned int prio) { return htons(id | (cfi << 12) | (prio << 13)); } static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb, int datalen) { struct timespec64 timestamp; struct pktgen_hdr *pgh; pgh = skb_put(skb, sizeof(*pgh)); datalen -= sizeof(*pgh); if (pkt_dev->nfrags <= 0) { skb_put_zero(skb, datalen); } else { int frags = pkt_dev->nfrags; int i, len; int frag_len; if (frags > MAX_SKB_FRAGS) frags = MAX_SKB_FRAGS; len = datalen - frags * PAGE_SIZE; if (len > 0) { skb_put_zero(skb, len); datalen = frags * PAGE_SIZE; } i = 0; frag_len = (datalen/frags) < PAGE_SIZE ? (datalen/frags) : PAGE_SIZE; while (datalen > 0) { if (unlikely(!pkt_dev->page)) { int node = numa_node_id(); if (pkt_dev->node >= 0 && (pkt_dev->flags & F_NODE)) node = pkt_dev->node; pkt_dev->page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0); if (!pkt_dev->page) break; } get_page(pkt_dev->page); /*last fragment, fill rest of data*/ if (i == (frags - 1)) skb_frag_fill_page_desc(&skb_shinfo(skb)->frags[i], pkt_dev->page, 0, (datalen < PAGE_SIZE ? datalen : PAGE_SIZE)); else skb_frag_fill_page_desc(&skb_shinfo(skb)->frags[i], pkt_dev->page, 0, frag_len); datalen -= skb_frag_size(&skb_shinfo(skb)->frags[i]); skb->len += skb_frag_size(&skb_shinfo(skb)->frags[i]); skb->data_len += skb_frag_size(&skb_shinfo(skb)->frags[i]); i++; skb_shinfo(skb)->nr_frags = i; } } /* Stamp the time, and sequence number, * convert them to network byte order */ pgh->pgh_magic = htonl(PKTGEN_MAGIC); pgh->seq_num = htonl(pkt_dev->seq_num); if (pkt_dev->flags & F_NO_TIMESTAMP) { pgh->tv_sec = 0; pgh->tv_usec = 0; } else { /* * pgh->tv_sec wraps in y2106 when interpreted as unsigned * as done by wireshark, or y2038 when interpreted as signed. * This is probably harmless, but if anyone wants to improve * it, we could introduce a variant that puts 64-bit nanoseconds * into the respective header bytes. * This would also be slightly faster to read. */ ktime_get_real_ts64(×tamp); pgh->tv_sec = htonl(timestamp.tv_sec); pgh->tv_usec = htonl(timestamp.tv_nsec / NSEC_PER_USEC); } } static struct sk_buff *pktgen_alloc_skb(struct net_device *dev, struct pktgen_dev *pkt_dev) { unsigned int extralen = LL_RESERVED_SPACE(dev); struct sk_buff *skb = NULL; unsigned int size; size = pkt_dev->cur_pkt_size + 64 + extralen + pkt_dev->pkt_overhead; if (pkt_dev->flags & F_NODE) { int node = pkt_dev->node >= 0 ? pkt_dev->node : numa_node_id(); skb = __alloc_skb(NET_SKB_PAD + size, GFP_NOWAIT, 0, node); if (likely(skb)) { skb_reserve(skb, NET_SKB_PAD); skb->dev = dev; } } else { skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT); } /* the caller pre-fetches from skb->data and reserves for the mac hdr */ if (likely(skb)) skb_reserve(skb, extralen - 16); return skb; } static struct sk_buff *fill_packet_ipv4(struct net_device *odev, struct pktgen_dev *pkt_dev) { struct sk_buff *skb = NULL; __u8 *eth; struct udphdr *udph; int datalen, iplen; struct iphdr *iph; __be16 protocol = htons(ETH_P_IP); __be32 *mpls; __be16 *vlan_tci = NULL; /* Encapsulates priority and VLAN ID */ __be16 *vlan_encapsulated_proto = NULL; /* packet type ID field (or len) for VLAN tag */ __be16 *svlan_tci = NULL; /* Encapsulates priority and SVLAN ID */ __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */ u16 queue_map; if (pkt_dev->nr_labels) protocol = htons(ETH_P_MPLS_UC); if (pkt_dev->vlan_id != 0xffff) protocol = htons(ETH_P_8021Q); /* Update any of the values, used when we're incrementing various * fields. */ mod_cur_headers(pkt_dev); queue_map = pkt_dev->cur_queue_map; skb = pktgen_alloc_skb(odev, pkt_dev); if (!skb) { sprintf(pkt_dev->result, "No memory"); return NULL; } prefetchw(skb->data); skb_reserve(skb, 16); /* Reserve for ethernet and IP header */ eth = skb_push(skb, 14); mpls = skb_put(skb, pkt_dev->nr_labels * sizeof(__u32)); if (pkt_dev->nr_labels) mpls_push(mpls, pkt_dev); if (pkt_dev->vlan_id != 0xffff) { if (pkt_dev->svlan_id != 0xffff) { svlan_tci = skb_put(skb, sizeof(__be16)); *svlan_tci = build_tci(pkt_dev->svlan_id, pkt_dev->svlan_cfi, pkt_dev->svlan_p); svlan_encapsulated_proto = skb_put(skb, sizeof(__be16)); *svlan_encapsulated_proto = htons(ETH_P_8021Q); } vlan_tci = skb_put(skb, sizeof(__be16)); *vlan_tci = build_tci(pkt_dev->vlan_id, pkt_dev->vlan_cfi, pkt_dev->vlan_p); vlan_encapsulated_proto = skb_put(skb, sizeof(__be16)); *vlan_encapsulated_proto = htons(ETH_P_IP); } skb_reset_mac_header(skb); skb_set_network_header(skb, skb->len); iph = skb_put(skb, sizeof(struct iphdr)); skb_set_transport_header(skb, skb->len); udph = skb_put(skb, sizeof(struct udphdr)); skb_set_queue_mapping(skb, queue_map); skb->priority = pkt_dev->skb_priority; memcpy(eth, pkt_dev->hh, 12); *(__be16 *)ð[12] = protocol; /* Eth + IPh + UDPh + mpls */ datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 - pkt_dev->pkt_overhead; if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) datalen = sizeof(struct pktgen_hdr); udph->source = htons(pkt_dev->cur_udp_src); udph->dest = htons(pkt_dev->cur_udp_dst); udph->len = htons(datalen + 8); /* DATA + udphdr */ udph->check = 0; iph->ihl = 5; iph->version = 4; iph->ttl = 32; iph->tos = pkt_dev->tos; iph->protocol = IPPROTO_UDP; /* UDP */ iph->saddr = pkt_dev->cur_saddr; iph->daddr = pkt_dev->cur_daddr; iph->id = htons(pkt_dev->ip_id); pkt_dev->ip_id++; iph->frag_off = 0; iplen = 20 + 8 + datalen; iph->tot_len = htons(iplen); ip_send_check(iph); skb->protocol = protocol; skb->dev = odev; skb->pkt_type = PACKET_HOST; pktgen_finalize_skb(pkt_dev, skb, datalen); if (!(pkt_dev->flags & F_UDPCSUM)) { skb->ip_summed = CHECKSUM_NONE; } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM)) { skb->ip_summed = CHECKSUM_PARTIAL; skb->csum = 0; udp4_hwcsum(skb, iph->saddr, iph->daddr); } else { __wsum csum = skb_checksum(skb, skb_transport_offset(skb), datalen + 8, 0); /* add protocol-dependent pseudo-header */ udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, datalen + 8, IPPROTO_UDP, csum); if (udph->check == 0) udph->check = CSUM_MANGLED_0; } #ifdef CONFIG_XFRM if (!process_ipsec(pkt_dev, skb, protocol)) return NULL; #endif return skb; } static struct sk_buff *fill_packet_ipv6(struct net_device *odev, struct pktgen_dev *pkt_dev) { struct sk_buff *skb = NULL; __u8 *eth; struct udphdr *udph; int datalen, udplen; struct ipv6hdr *iph; __be16 protocol = htons(ETH_P_IPV6); __be32 *mpls; __be16 *vlan_tci = NULL; /* Encapsulates priority and VLAN ID */ __be16 *vlan_encapsulated_proto = NULL; /* packet type ID field (or len) for VLAN tag */ __be16 *svlan_tci = NULL; /* Encapsulates priority and SVLAN ID */ __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */ u16 queue_map; if (pkt_dev->nr_labels) protocol = htons(ETH_P_MPLS_UC); if (pkt_dev->vlan_id != 0xffff) protocol = htons(ETH_P_8021Q); /* Update any of the values, used when we're incrementing various * fields. */ mod_cur_headers(pkt_dev); queue_map = pkt_dev->cur_queue_map; skb = pktgen_alloc_skb(odev, pkt_dev); if (!skb) { sprintf(pkt_dev->result, "No memory"); return NULL; } prefetchw(skb->data); skb_reserve(skb, 16); /* Reserve for ethernet and IP header */ eth = skb_push(skb, 14); mpls = skb_put(skb, pkt_dev->nr_labels * sizeof(__u32)); if (pkt_dev->nr_labels) mpls_push(mpls, pkt_dev); if (pkt_dev->vlan_id != 0xffff) { if (pkt_dev->svlan_id != 0xffff) { svlan_tci = skb_put(skb, sizeof(__be16)); *svlan_tci = build_tci(pkt_dev->svlan_id, pkt_dev->svlan_cfi, pkt_dev->svlan_p); svlan_encapsulated_proto = skb_put(skb, sizeof(__be16)); *svlan_encapsulated_proto = htons(ETH_P_8021Q); } vlan_tci = skb_put(skb, sizeof(__be16)); *vlan_tci = build_tci(pkt_dev->vlan_id, pkt_dev->vlan_cfi, pkt_dev->vlan_p); vlan_encapsulated_proto = skb_put(skb, sizeof(__be16)); *vlan_encapsulated_proto = htons(ETH_P_IPV6); } skb_reset_mac_header(skb); skb_set_network_header(skb, skb->len); iph = skb_put(skb, sizeof(struct ipv6hdr)); skb_set_transport_header(skb, skb->len); udph = skb_put(skb, sizeof(struct udphdr)); skb_set_queue_mapping(skb, queue_map); skb->priority = pkt_dev->skb_priority; memcpy(eth, pkt_dev->hh, 12); *(__be16 *) ð[12] = protocol; /* Eth + IPh + UDPh + mpls */ datalen = pkt_dev->cur_pkt_size - 14 - sizeof(struct ipv6hdr) - sizeof(struct udphdr) - pkt_dev->pkt_overhead; if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) { datalen = sizeof(struct pktgen_hdr); net_info_ratelimited("increased datalen to %d\n", datalen); } udplen = datalen + sizeof(struct udphdr); udph->source = htons(pkt_dev->cur_udp_src); udph->dest = htons(pkt_dev->cur_udp_dst); udph->len = htons(udplen); udph->check = 0; *(__be32 *) iph = htonl(0x60000000); /* Version + flow */ if (pkt_dev->traffic_class) { /* Version + traffic class + flow (0) */ *(__be32 *)iph |= htonl(0x60000000 | (pkt_dev->traffic_class << 20)); } iph->hop_limit = 32; iph->payload_len = htons(udplen); iph->nexthdr = IPPROTO_UDP; iph->daddr = pkt_dev->cur_in6_daddr; iph->saddr = pkt_dev->cur_in6_saddr; skb->protocol = protocol; skb->dev = odev; skb->pkt_type = PACKET_HOST; pktgen_finalize_skb(pkt_dev, skb, datalen); if (!(pkt_dev->flags & F_UDPCSUM)) { skb->ip_summed = CHECKSUM_NONE; } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM)) { skb->ip_summed = CHECKSUM_PARTIAL; skb->csum_start = skb_transport_header(skb) - skb->head; skb->csum_offset = offsetof(struct udphdr, check); udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0); } else { __wsum csum = skb_checksum(skb, skb_transport_offset(skb), udplen, 0); /* add protocol-dependent pseudo-header */ udph->check = csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, csum); if (udph->check == 0) udph->check = CSUM_MANGLED_0; } return skb; } static struct sk_buff *fill_packet(struct net_device *odev, struct pktgen_dev *pkt_dev) { if (pkt_dev->flags & F_IPV6) return fill_packet_ipv6(odev, pkt_dev); else return fill_packet_ipv4(odev, pkt_dev); } static void pktgen_clear_counters(struct pktgen_dev *pkt_dev) { pkt_dev->seq_num = 1; pkt_dev->idle_acc = 0; pkt_dev->sofar = 0; pkt_dev->tx_bytes = 0; pkt_dev->errors = 0; } /* Set up structure for sending pkts, clear counters */ static void pktgen_run(struct pktgen_thread *t) { struct pktgen_dev *pkt_dev; int started = 0; func_enter(); rcu_read_lock(); list_for_each_entry_rcu(pkt_dev, &t->if_list, list) { /* * setup odev and create initial packet. */ pktgen_setup_inject(pkt_dev); if (pkt_dev->odev) { pktgen_clear_counters(pkt_dev); pkt_dev->skb = NULL; pkt_dev->started_at = pkt_dev->next_tx = ktime_get(); set_pkt_overhead(pkt_dev); strscpy(pkt_dev->result, "Starting"); pkt_dev->running = 1; /* Cranke yeself! */ started++; } else strscpy(pkt_dev->result, "Error starting"); } rcu_read_unlock(); if (started) t->control &= ~(T_STOP); } static void pktgen_handle_all_threads(struct pktgen_net *pn, u32 flags) { struct pktgen_thread *t; mutex_lock(&pktgen_thread_lock); list_for_each_entry(t, &pn->pktgen_threads, th_list) t->control |= (flags); mutex_unlock(&pktgen_thread_lock); } static void pktgen_stop_all_threads(struct pktgen_net *pn) { func_enter(); pktgen_handle_all_threads(pn, T_STOP); } static int thread_is_running(const struct pktgen_thread *t) { const struct pktgen_dev *pkt_dev; rcu_read_lock(); list_for_each_entry_rcu(pkt_dev, &t->if_list, list) if (pkt_dev->running) { rcu_read_unlock(); return 1; } rcu_read_unlock(); return 0; } static int pktgen_wait_thread_run(struct pktgen_thread *t) { while (thread_is_running(t)) { /* note: 't' will still be around even after the unlock/lock * cycle because pktgen_thread threads are only cleared at * net exit */ mutex_unlock(&pktgen_thread_lock); msleep_interruptible(100); mutex_lock(&pktgen_thread_lock); if (signal_pending(current)) goto signal; } return 1; signal: return 0; } static int pktgen_wait_all_threads_run(struct pktgen_net *pn) { struct pktgen_thread *t; int sig = 1; /* prevent from racing with rmmod */ if (!try_module_get(THIS_MODULE)) return sig; mutex_lock(&pktgen_thread_lock); list_for_each_entry(t, &pn->pktgen_threads, th_list) { sig = pktgen_wait_thread_run(t); if (sig == 0) break; } if (sig == 0) list_for_each_entry(t, &pn->pktgen_threads, th_list) t->control |= (T_STOP); mutex_unlock(&pktgen_thread_lock); module_put(THIS_MODULE); return sig; } static void pktgen_run_all_threads(struct pktgen_net *pn) { func_enter(); pktgen_handle_all_threads(pn, T_RUN); /* Propagate thread->control */ schedule_timeout_interruptible(msecs_to_jiffies(125)); pktgen_wait_all_threads_run(pn); } static void pktgen_reset_all_threads(struct pktgen_net *pn) { func_enter(); pktgen_handle_all_threads(pn, T_REMDEVALL); /* Propagate thread->control */ schedule_timeout_interruptible(msecs_to_jiffies(125)); pktgen_wait_all_threads_run(pn); } static void show_results(struct pktgen_dev *pkt_dev, int nr_frags) { __u64 bps, mbps, pps; char *p = pkt_dev->result; ktime_t elapsed = ktime_sub(pkt_dev->stopped_at, pkt_dev->started_at); ktime_t idle = ns_to_ktime(pkt_dev->idle_acc); p += sprintf(p, "OK: %llu(c%llu+d%llu) usec, %llu (%dbyte,%dfrags)\n", (unsigned long long)ktime_to_us(elapsed), (unsigned long long)ktime_to_us(ktime_sub(elapsed, idle)), (unsigned long long)ktime_to_us(idle), (unsigned long long)pkt_dev->sofar, pkt_dev->cur_pkt_size, nr_frags); pps = div64_u64(pkt_dev->sofar * NSEC_PER_SEC, ktime_to_ns(elapsed)); if (pkt_dev->n_imix_entries > 0) { int i; struct imix_pkt *entry; bps = 0; for (i = 0; i < pkt_dev->n_imix_entries; i++) { entry = &pkt_dev->imix_entries[i]; bps += entry->size * entry->count_so_far; } bps = div64_u64(bps * 8 * NSEC_PER_SEC, ktime_to_ns(elapsed)); } else { bps = pps * 8 * pkt_dev->cur_pkt_size; } mbps = bps; do_div(mbps, 1000000); p += sprintf(p, " %llupps %lluMb/sec (%llubps) errors: %llu", (unsigned long long)pps, (unsigned long long)mbps, (unsigned long long)bps, (unsigned long long)pkt_dev->errors); } /* Set stopped-at timer, remove from running list, do counters & statistics */ static int pktgen_stop_device(struct pktgen_dev *pkt_dev) { int nr_frags = pkt_dev->skb ? skb_shinfo(pkt_dev->skb)->nr_frags : -1; if (!pkt_dev->running) { pr_warn("interface: %s is already stopped\n", pkt_dev->odevname); return -EINVAL; } pkt_dev->running = 0; kfree_skb(pkt_dev->skb); pkt_dev->skb = NULL; pkt_dev->stopped_at = ktime_get(); show_results(pkt_dev, nr_frags); return 0; } static struct pktgen_dev *next_to_run(struct pktgen_thread *t) { struct pktgen_dev *pkt_dev, *best = NULL; rcu_read_lock(); list_for_each_entry_rcu(pkt_dev, &t->if_list, list) { if (!pkt_dev->running) continue; if (best == NULL) best = pkt_dev; else if (ktime_compare(pkt_dev->next_tx, best->next_tx) < 0) best = pkt_dev; } rcu_read_unlock(); return best; } static void pktgen_stop(struct pktgen_thread *t) { struct pktgen_dev *pkt_dev; func_enter(); rcu_read_lock(); list_for_each_entry_rcu(pkt_dev, &t->if_list, list) { pktgen_stop_device(pkt_dev); } rcu_read_unlock(); } /* * one of our devices needs to be removed - find it * and remove it */ static void pktgen_rem_one_if(struct pktgen_thread *t) { struct list_head *q, *n; struct pktgen_dev *cur; func_enter(); list_for_each_safe(q, n, &t->if_list) { cur = list_entry(q, struct pktgen_dev, list); if (!cur->removal_mark) continue; kfree_skb(cur->skb); cur->skb = NULL; pktgen_remove_device(t, cur); break; } } static void pktgen_rem_all_ifs(struct pktgen_thread *t) { struct list_head *q, *n; struct pktgen_dev *cur; func_enter(); /* Remove all devices, free mem */ list_for_each_safe(q, n, &t->if_list) { cur = list_entry(q, struct pktgen_dev, list); kfree_skb(cur->skb); cur->skb = NULL; pktgen_remove_device(t, cur); } } static void pktgen_rem_thread(struct pktgen_thread *t) { /* Remove from the thread list */ remove_proc_entry(t->tsk->comm, t->net->proc_dir); } static void pktgen_resched(struct pktgen_dev *pkt_dev) { ktime_t idle_start = ktime_get(); schedule(); pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start)); } static void pktgen_wait_for_skb(struct pktgen_dev *pkt_dev) { ktime_t idle_start = ktime_get(); while (refcount_read(&(pkt_dev->skb->users)) != 1) { if (signal_pending(current)) break; if (need_resched()) pktgen_resched(pkt_dev); else cpu_relax(); } pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start)); } static void pktgen_xmit(struct pktgen_dev *pkt_dev) { bool skb_shared = !!(READ_ONCE(pkt_dev->flags) & F_SHARED); struct net_device *odev = pkt_dev->odev; struct netdev_queue *txq; unsigned int burst = 1; struct sk_buff *skb; int clone_skb = 0; int ret; /* If 'skb_shared' is false, the read of possible * new values (if any) for 'burst' and 'clone_skb' will be skipped to * prevent some concurrent changes from slipping in. And the stabilized * config will be read in during the next run of pktgen_xmit. */ if (skb_shared) { burst = READ_ONCE(pkt_dev->burst); clone_skb = READ_ONCE(pkt_dev->clone_skb); } /* If device is offline, then don't send */ if (unlikely(!netif_running(odev) || !netif_carrier_ok(odev))) { pktgen_stop_device(pkt_dev); return; } /* This is max DELAY, this has special meaning of * "never transmit" */ if (unlikely(pkt_dev->delay == ULLONG_MAX)) { pkt_dev->next_tx = ktime_add_ns(ktime_get(), ULONG_MAX); return; } /* If no skb or clone count exhausted then get new one */ if (!pkt_dev->skb || (pkt_dev->last_ok && ++pkt_dev->clone_count >= clone_skb)) { /* build a new pkt */ kfree_skb(pkt_dev->skb); pkt_dev->skb = fill_packet(odev, pkt_dev); if (pkt_dev->skb == NULL) { pr_err("ERROR: couldn't allocate skb in fill_packet\n"); schedule(); pkt_dev->clone_count--; /* back out increment, OOM */ return; } pkt_dev->last_pkt_size = pkt_dev->skb->len; pkt_dev->clone_count = 0; /* reset counter */ } if (pkt_dev->delay && pkt_dev->last_ok) spin(pkt_dev, pkt_dev->next_tx); if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) { skb = pkt_dev->skb; skb->protocol = eth_type_trans(skb, skb->dev); if (skb_shared) refcount_add(burst, &skb->users); local_bh_disable(); do { ret = netif_receive_skb(skb); if (ret == NET_RX_DROP) pkt_dev->errors++; pkt_dev->sofar++; pkt_dev->seq_num++; if (unlikely(!skb_shared)) { pkt_dev->skb = NULL; break; } if (refcount_read(&skb->users) != burst) { /* skb was queued by rps/rfs or taps, * so cannot reuse this skb */ WARN_ON(refcount_sub_and_test(burst - 1, &skb->users)); /* get out of the loop and wait * until skb is consumed */ break; } /* skb was 'freed' by stack, so clean few * bits and reuse it */ skb_reset_redirect(skb); } while (--burst > 0); goto out; /* Skips xmit_mode M_START_XMIT */ } else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) { local_bh_disable(); if (skb_shared) refcount_inc(&pkt_dev->skb->users); ret = dev_queue_xmit(pkt_dev->skb); if (!skb_shared && dev_xmit_complete(ret)) pkt_dev->skb = NULL; switch (ret) { case NET_XMIT_SUCCESS: pkt_dev->sofar++; pkt_dev->seq_num++; pkt_dev->tx_bytes += pkt_dev->last_pkt_size; break; case NET_XMIT_DROP: case NET_XMIT_CN: /* These are all valid return codes for a qdisc but * indicate packets are being dropped or will likely * be dropped soon. */ case NETDEV_TX_BUSY: /* qdisc may call dev_hard_start_xmit directly in cases * where no queues exist e.g. loopback device, virtual * devices, etc. In this case we need to handle * NETDEV_TX_ codes. */ default: pkt_dev->errors++; net_info_ratelimited("%s xmit error: %d\n", pkt_dev->odevname, ret); break; } goto out; } txq = skb_get_tx_queue(odev, pkt_dev->skb); local_bh_disable(); HARD_TX_LOCK(odev, txq, smp_processor_id()); if (unlikely(netif_xmit_frozen_or_drv_stopped(txq))) { pkt_dev->last_ok = 0; goto unlock; } if (skb_shared) refcount_add(burst, &pkt_dev->skb->users); xmit_more: ret = netdev_start_xmit(pkt_dev->skb, odev, txq, --burst > 0); if (!skb_shared && dev_xmit_complete(ret)) pkt_dev->skb = NULL; switch (ret) { case NETDEV_TX_OK: pkt_dev->last_ok = 1; pkt_dev->sofar++; pkt_dev->seq_num++; pkt_dev->tx_bytes += pkt_dev->last_pkt_size; if (burst > 0 && !netif_xmit_frozen_or_drv_stopped(txq)) goto xmit_more; break; case NET_XMIT_DROP: case NET_XMIT_CN: /* skb has been consumed */ pkt_dev->errors++; break; default: /* Drivers are not supposed to return other values! */ net_info_ratelimited("%s xmit error: %d\n", pkt_dev->odevname, ret); pkt_dev->errors++; fallthrough; case NETDEV_TX_BUSY: /* Retry it next time */ if (skb_shared) refcount_dec(&pkt_dev->skb->users); pkt_dev->last_ok = 0; } if (unlikely(burst)) WARN_ON(refcount_sub_and_test(burst, &pkt_dev->skb->users)); unlock: HARD_TX_UNLOCK(odev, txq); out: local_bh_enable(); /* If pkt_dev->count is zero, then run forever */ if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) { if (pkt_dev->skb) pktgen_wait_for_skb(pkt_dev); /* Done with this */ pktgen_stop_device(pkt_dev); } } /* * Main loop of the thread goes here */ static int pktgen_thread_worker(void *arg) { struct pktgen_thread *t = arg; struct pktgen_dev *pkt_dev = NULL; int cpu = t->cpu; WARN_ON_ONCE(smp_processor_id() != cpu); init_waitqueue_head(&t->queue); complete(&t->start_done); pr_debug("starting pktgen/%d: pid=%d\n", cpu, task_pid_nr(current)); set_freezable(); while (!kthread_should_stop()) { pkt_dev = next_to_run(t); if (unlikely(!pkt_dev && t->control == 0)) { if (t->net->pktgen_exiting) break; wait_event_freezable_timeout(t->queue, t->control != 0, HZ / 10); continue; } if (likely(pkt_dev)) { pktgen_xmit(pkt_dev); if (need_resched()) pktgen_resched(pkt_dev); else cpu_relax(); } if (t->control & T_STOP) { pktgen_stop(t); t->control &= ~(T_STOP); } if (t->control & T_RUN) { pktgen_run(t); t->control &= ~(T_RUN); } if (t->control & T_REMDEVALL) { pktgen_rem_all_ifs(t); t->control &= ~(T_REMDEVALL); } if (t->control & T_REMDEV) { pktgen_rem_one_if(t); t->control &= ~(T_REMDEV); } try_to_freeze(); } pr_debug("%s stopping all device\n", t->tsk->comm); pktgen_stop(t); pr_debug("%s removing all device\n", t->tsk->comm); pktgen_rem_all_ifs(t); pr_debug("%s removing thread\n", t->tsk->comm); pktgen_rem_thread(t); return 0; } static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t, const char *ifname, bool exact) { struct pktgen_dev *p, *pkt_dev = NULL; size_t len = strlen(ifname); rcu_read_lock(); list_for_each_entry_rcu(p, &t->if_list, list) if (strncmp(p->odevname, ifname, len) == 0) { if (p->odevname[len]) { if (exact || p->odevname[len] != '@') continue; } pkt_dev = p; break; } rcu_read_unlock(); pr_debug("find_dev(%s) returning %p\n", ifname, pkt_dev); return pkt_dev; } /* * Adds a dev at front of if_list. */ static int add_dev_to_thread(struct pktgen_thread *t, struct pktgen_dev *pkt_dev) { int rv = 0; /* This function cannot be called concurrently, as its called * under pktgen_thread_lock mutex, but it can run from * userspace on another CPU than the kthread. The if_lock() * is used here to sync with concurrent instances of * _rem_dev_from_if_list() invoked via kthread, which is also * updating the if_list */ if_lock(t); if (pkt_dev->pg_thread) { pr_err("ERROR: already assigned to a thread\n"); rv = -EBUSY; goto out; } pkt_dev->running = 0; pkt_dev->pg_thread = t; list_add_rcu(&pkt_dev->list, &t->if_list); out: if_unlock(t); return rv; } /* Called under thread lock */ static int pktgen_add_device(struct pktgen_thread *t, const char *ifname) { struct pktgen_dev *pkt_dev; int err; int node = cpu_to_node(t->cpu); /* We don't allow a device to be on several threads */ pkt_dev = __pktgen_NN_threads(t->net, ifname, FIND); if (pkt_dev) { pr_err("ERROR: interface already used\n"); return -EBUSY; } pkt_dev = kzalloc_node(sizeof(struct pktgen_dev), GFP_KERNEL, node); if (!pkt_dev) return -ENOMEM; strscpy(pkt_dev->odevname, ifname); pkt_dev->flows = vzalloc_node(array_size(MAX_CFLOWS, sizeof(struct flow_state)), node); if (pkt_dev->flows == NULL) { kfree(pkt_dev); return -ENOMEM; } pkt_dev->removal_mark = 0; pkt_dev->nfrags = 0; pkt_dev->delay = pg_delay_d; pkt_dev->count = pg_count_d; pkt_dev->sofar = 0; pkt_dev->udp_src_min = 9; /* sink port */ pkt_dev->udp_src_max = 9; pkt_dev->udp_dst_min = 9; pkt_dev->udp_dst_max = 9; pkt_dev->vlan_p = 0; pkt_dev->vlan_cfi = 0; pkt_dev->vlan_id = 0xffff; pkt_dev->svlan_p = 0; pkt_dev->svlan_cfi = 0; pkt_dev->svlan_id = 0xffff; pkt_dev->burst = 1; pkt_dev->node = NUMA_NO_NODE; pkt_dev->flags = F_SHARED; /* SKB shared by default */ err = pktgen_setup_dev(t->net, pkt_dev, ifname); if (err) goto out1; if (pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING) pkt_dev->clone_skb = pg_clone_skb_d; pkt_dev->entry = proc_create_data(ifname, 0600, t->net->proc_dir, &pktgen_if_proc_ops, pkt_dev); if (!pkt_dev->entry) { pr_err("cannot create %s/%s procfs entry\n", PG_PROC_DIR, ifname); err = -EINVAL; goto out2; } #ifdef CONFIG_XFRM pkt_dev->ipsmode = XFRM_MODE_TRANSPORT; pkt_dev->ipsproto = IPPROTO_ESP; /* xfrm tunnel mode needs additional dst to extract outer * ip header protocol/ttl/id field, here create a phony one. * instead of looking for a valid rt, which definitely hurting * performance under such circumstance. */ pkt_dev->dstops.family = AF_INET; pkt_dev->xdst.u.dst.dev = pkt_dev->odev; dst_init_metrics(&pkt_dev->xdst.u.dst, pktgen_dst_metrics, false); pkt_dev->xdst.child = &pkt_dev->xdst.u.dst; pkt_dev->xdst.u.dst.ops = &pkt_dev->dstops; #endif return add_dev_to_thread(t, pkt_dev); out2: netdev_put(pkt_dev->odev, &pkt_dev->dev_tracker); out1: #ifdef CONFIG_XFRM free_SAs(pkt_dev); #endif vfree(pkt_dev->flows); kfree(pkt_dev); return err; } static int __net_init pktgen_create_thread(int cpu, struct pktgen_net *pn) { struct pktgen_thread *t; struct proc_dir_entry *pe; struct task_struct *p; t = kzalloc_node(sizeof(struct pktgen_thread), GFP_KERNEL, cpu_to_node(cpu)); if (!t) { pr_err("ERROR: out of memory, can't create new thread\n"); return -ENOMEM; } mutex_init(&t->if_lock); t->cpu = cpu; INIT_LIST_HEAD(&t->if_list); list_add_tail(&t->th_list, &pn->pktgen_threads); init_completion(&t->start_done); p = kthread_create_on_cpu(pktgen_thread_worker, t, cpu, "kpktgend_%d"); if (IS_ERR(p)) { pr_err("kthread_create_on_node() failed for cpu %d\n", t->cpu); list_del(&t->th_list); kfree(t); return PTR_ERR(p); } t->tsk = p; pe = proc_create_data(t->tsk->comm, 0600, pn->proc_dir, &pktgen_thread_proc_ops, t); if (!pe) { pr_err("cannot create %s/%s procfs entry\n", PG_PROC_DIR, t->tsk->comm); kthread_stop(p); list_del(&t->th_list); kfree(t); return -EINVAL; } t->net = pn; get_task_struct(p); wake_up_process(p); wait_for_completion(&t->start_done); return 0; } /* * Removes a device from the thread if_list. */ static void _rem_dev_from_if_list(struct pktgen_thread *t, struct pktgen_dev *pkt_dev) { struct list_head *q, *n; struct pktgen_dev *p; if_lock(t); list_for_each_safe(q, n, &t->if_list) { p = list_entry(q, struct pktgen_dev, list); if (p == pkt_dev) list_del_rcu(&p->list); } if_unlock(t); } static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *pkt_dev) { pr_debug("remove_device pkt_dev=%p\n", pkt_dev); if (pkt_dev->running) { pr_warn("WARNING: trying to remove a running interface, stopping it now\n"); pktgen_stop_device(pkt_dev); } /* Dis-associate from the interface */ if (pkt_dev->odev) { netdev_put(pkt_dev->odev, &pkt_dev->dev_tracker); pkt_dev->odev = NULL; } /* Remove proc before if_list entry, because add_device uses * list to determine if interface already exist, avoid race * with proc_create_data() */ proc_remove(pkt_dev->entry); /* And update the thread if_list */ _rem_dev_from_if_list(t, pkt_dev); #ifdef CONFIG_XFRM free_SAs(pkt_dev); #endif vfree(pkt_dev->flows); if (pkt_dev->page) put_page(pkt_dev->page); kfree_rcu(pkt_dev, rcu); return 0; } static int __net_init pg_net_init(struct net *net) { struct pktgen_net *pn = net_generic(net, pg_net_id); struct proc_dir_entry *pe; int cpu, ret = 0; pn->net = net; INIT_LIST_HEAD(&pn->pktgen_threads); pn->pktgen_exiting = false; pn->proc_dir = proc_mkdir(PG_PROC_DIR, pn->net->proc_net); if (!pn->proc_dir) { pr_warn("cannot create /proc/net/%s\n", PG_PROC_DIR); return -ENODEV; } pe = proc_create(PGCTRL, 0600, pn->proc_dir, &pktgen_proc_ops); if (pe == NULL) { pr_err("cannot create %s procfs entry\n", PGCTRL); ret = -EINVAL; goto remove; } cpus_read_lock(); for_each_online_cpu(cpu) { int err; err = pktgen_create_thread(cpu, pn); if (err) pr_warn("Cannot create thread for cpu %d (%d)\n", cpu, err); } cpus_read_unlock(); if (list_empty(&pn->pktgen_threads)) { pr_err("Initialization failed for all threads\n"); ret = -ENODEV; goto remove_entry; } return 0; remove_entry: remove_proc_entry(PGCTRL, pn->proc_dir); remove: remove_proc_entry(PG_PROC_DIR, pn->net->proc_net); return ret; } static void __net_exit pg_net_exit(struct net *net) { struct pktgen_net *pn = net_generic(net, pg_net_id); struct pktgen_thread *t; struct list_head *q, *n; LIST_HEAD(list); /* Stop all interfaces & threads */ pn->pktgen_exiting = true; mutex_lock(&pktgen_thread_lock); list_splice_init(&pn->pktgen_threads, &list); mutex_unlock(&pktgen_thread_lock); list_for_each_safe(q, n, &list) { t = list_entry(q, struct pktgen_thread, th_list); list_del(&t->th_list); kthread_stop_put(t->tsk); kfree(t); } remove_proc_entry(PGCTRL, pn->proc_dir); remove_proc_entry(PG_PROC_DIR, pn->net->proc_net); } static struct pernet_operations pg_net_ops = { .init = pg_net_init, .exit = pg_net_exit, .id = &pg_net_id, .size = sizeof(struct pktgen_net), }; static int __init pg_init(void) { int ret = 0; pr_info("%s", version); ret = register_pernet_subsys(&pg_net_ops); if (ret) return ret; ret = register_netdevice_notifier(&pktgen_notifier_block); if (ret) unregister_pernet_subsys(&pg_net_ops); return ret; } static void __exit pg_cleanup(void) { unregister_netdevice_notifier(&pktgen_notifier_block); unregister_pernet_subsys(&pg_net_ops); /* Don't need rcu_barrier() due to use of kfree_rcu() */ } module_init(pg_init); module_exit(pg_cleanup); MODULE_AUTHOR("Robert Olsson <robert.olsson@its.uu.se>"); MODULE_DESCRIPTION("Packet Generator tool"); MODULE_LICENSE("GPL"); MODULE_VERSION(VERSION); module_param(pg_count_d, int, 0); MODULE_PARM_DESC(pg_count_d, "Default number of packets to inject"); module_param(pg_delay_d, int, 0); MODULE_PARM_DESC(pg_delay_d, "Default delay between packets (nanoseconds)"); module_param(pg_clone_skb_d, int, 0); MODULE_PARM_DESC(pg_clone_skb_d, "Default number of copies of the same packet"); module_param(debug, int, 0); MODULE_PARM_DESC(debug, "Enable debugging of pktgen module");
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2026-10-10