cregit-Linux how code gets into the kernel

Release 4.15 net/ipv4/ip_gre.c

Directory: net/ipv4
/*
 *      Linux NET3:     GRE over IP protocol decoder.
 *
 *      Authors: Alexey Kuznetsov (kuznet@ms2.inr.ac.ru)
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 *
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/capability.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/in.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
#include <linux/init.h>
#include <linux/in6.h>
#include <linux/inetdevice.h>
#include <linux/igmp.h>
#include <linux/netfilter_ipv4.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>

#include <net/sock.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/protocol.h>
#include <net/ip_tunnels.h>
#include <net/arp.h>
#include <net/checksum.h>
#include <net/dsfield.h>
#include <net/inet_ecn.h>
#include <net/xfrm.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.h>
#include <net/gre.h>
#include <net/dst_metadata.h>
#include <net/erspan.h>

/*
   Problems & solutions
   --------------------

   1. The most important issue is detecting local dead loops.
   They would cause complete host lockup in transmit, which
   would be "resolved" by stack overflow or, if queueing is enabled,
   with infinite looping in net_bh.

   We cannot track such dead loops during route installation,
   it is infeasible task. The most general solutions would be
   to keep skb->encapsulation counter (sort of local ttl),
   and silently drop packet when it expires. It is a good
   solution, but it supposes maintaining new variable in ALL
   skb, even if no tunneling is used.

   Current solution: xmit_recursion breaks dead loops. This is a percpu
   counter, since when we enter the first ndo_xmit(), cpu migration is
   forbidden. We force an exit if this counter reaches RECURSION_LIMIT

   2. Networking dead loops would not kill routers, but would really
   kill network. IP hop limit plays role of "t->recursion" in this case,
   if we copy it from packet being encapsulated to upper header.
   It is very good solution, but it introduces two problems:

   - Routing protocols, using packets with ttl=1 (OSPF, RIP2),
     do not work over tunnels.
   - traceroute does not work. I planned to relay ICMP from tunnel,
     so that this problem would be solved and traceroute output
     would even more informative. This idea appeared to be wrong:
     only Linux complies to rfc1812 now (yes, guys, Linux is the only
     true router now :-)), all routers (at least, in neighbourhood of mine)
     return only 8 bytes of payload. It is the end.

   Hence, if we want that OSPF worked or traceroute said something reasonable,
   we should search for another solution.

   One of them is to parse packet trying to detect inner encapsulation
   made by our node. It is difficult or even impossible, especially,
   taking into account fragmentation. TO be short, ttl is not solution at all.

   Current solution: The solution was UNEXPECTEDLY SIMPLE.
   We force DF flag on tunnels with preconfigured hop limit,
   that is ALL. :-) Well, it does not remove the problem completely,
   but exponential growth of network traffic is changed to linear
   (branches, that exceed pmtu are pruned) and tunnel mtu
   rapidly degrades to value <68, where looping stops.
   Yes, it is not good if there exists a router in the loop,
   which does not force DF, even when encapsulating packets have DF set.
   But it is not our problem! Nobody could accuse us, we made
   all that we could make. Even if it is your gated who injected
   fatal route to network, even if it were you who configured
   fatal static route: you are innocent. :-)

   Alexey Kuznetsov.
 */


static bool log_ecn_error = true;
module_param(log_ecn_error, bool, 0644);
MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");


static struct rtnl_link_ops ipgre_link_ops __read_mostly;
static int ipgre_tunnel_init(struct net_device *dev);
static void erspan_build_header(struct sk_buff *skb,
				__be32 id, u32 index, bool truncate);


static unsigned int ipgre_net_id __read_mostly;

static unsigned int gre_tap_net_id __read_mostly;

static unsigned int erspan_net_id __read_mostly;


static void ipgre_err(struct sk_buff *skb, u32 info, const struct tnl_ptk_info *tpi) { /* All the routers (except for Linux) return only 8 bytes of packet payload. It means, that precise relaying of ICMP in the real Internet is absolutely infeasible. Moreover, Cisco "wise men" put GRE key to the third word in GRE header. It makes impossible maintaining even soft state for keyed GRE tunnels with enabled checksum. Tell them "thank you". Well, I wonder, rfc1812 was written by Cisco employee, what the hell these idiots break standards established by themselves??? */ struct net *net = dev_net(skb->dev); struct ip_tunnel_net *itn; const struct iphdr *iph; const int type = icmp_hdr(skb)->type; const int code = icmp_hdr(skb)->code; unsigned int data_len = 0; struct ip_tunnel *t; switch (type) { default: case ICMP_PARAMETERPROB: return; case ICMP_DEST_UNREACH: switch (code) { case ICMP_SR_FAILED: case ICMP_PORT_UNREACH: /* Impossible event. */ return; default: /* All others are translated to HOST_UNREACH. rfc2003 contains "deep thoughts" about NET_UNREACH, I believe they are just ether pollution. --ANK */ break; } break; case ICMP_TIME_EXCEEDED: if (code != ICMP_EXC_TTL) return; data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ break; case ICMP_REDIRECT: break; } if (tpi->proto == htons(ETH_P_TEB)) itn = net_generic(net, gre_tap_net_id); else itn = net_generic(net, ipgre_net_id); iph = (const struct iphdr *)(icmp_hdr(skb) + 1); t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, iph->daddr, iph->saddr, tpi->key); if (!t) return; #if IS_ENABLED(CONFIG_IPV6) if (tpi->proto == htons(ETH_P_IPV6) && !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len, type, data_len)) return; #endif if (t->parms.iph.daddr == 0 || ipv4_is_multicast(t->parms.iph.daddr)) return; if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) return; if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) t->err_count++; else t->err_count = 1; t->err_time = jiffies; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar17552.24%317.65%
Eric Dumazet7422.09%423.53%
Linus Torvalds (pre-git)6720.00%211.76%
Duan Jiong72.09%15.88%
Pavel Emelyanov41.19%211.76%
Linus Torvalds20.60%15.88%
Patrick McHardy20.60%15.88%
Stephen Hemminger20.60%15.88%
Hideaki Yoshifuji / 吉藤英明10.30%15.88%
Ian Morris10.30%15.88%
Total335100.00%17100.00%


static void gre_err(struct sk_buff *skb, u32 info) { /* All the routers (except for Linux) return only * 8 bytes of packet payload. It means, that precise relaying of * ICMP in the real Internet is absolutely infeasible. * * Moreover, Cisco "wise men" put GRE key to the third word * in GRE header. It makes impossible maintaining even soft * state for keyed * GRE tunnels with enabled checksum. Tell them "thank you". * * Well, I wonder, rfc1812 was written by Cisco employee, * what the hell these idiots break standards established * by themselves??? */ const struct iphdr *iph = (struct iphdr *)skb->data; const int type = icmp_hdr(skb)->type; const int code = icmp_hdr(skb)->code; struct tnl_ptk_info tpi; bool csum_err = false; if (gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), iph->ihl * 4) < 0) { if (!csum_err) /* ignore csum errors. */ return; } if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { ipv4_update_pmtu(skb, dev_net(skb->dev), info, skb->dev->ifindex, 0, IPPROTO_GRE, 0); return; } if (type == ICMP_REDIRECT) { ipv4_redirect(skb, dev_net(skb->dev), skb->dev->ifindex, 0, IPPROTO_GRE, 0); return; } ipgre_err(skb, info, &tpi); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar14883.15%116.67%
Eric Dumazet2111.80%116.67%
Haishuang Yan52.81%116.67%
Jiri Benc21.12%116.67%
Tom Herbert10.56%116.67%
Linus Torvalds (pre-git)10.56%116.67%
Total178100.00%6100.00%


static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi, int gre_hdr_len) { struct net *net = dev_net(skb->dev); struct metadata_dst *tun_dst = NULL; struct ip_tunnel_net *itn; struct ip_tunnel *tunnel; struct erspanhdr *ershdr; const struct iphdr *iph; __be32 index; int len; itn = net_generic(net, erspan_net_id); len = gre_hdr_len + sizeof(*ershdr); if (unlikely(!pskb_may_pull(skb, len))) return PACKET_REJECT; iph = ip_hdr(skb); ershdr = (struct erspanhdr *)(skb->data + gre_hdr_len); /* The original GRE header does not have key field, * Use ERSPAN 10-bit session ID as key. */ tpi->key = cpu_to_be32(ntohs(ershdr->session_id) & ID_MASK); index = ershdr->md.index; tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags | TUNNEL_KEY, iph->saddr, iph->daddr, tpi->key); if (tunnel) { if (__iptunnel_pull_header(skb, gre_hdr_len + sizeof(*ershdr), htons(ETH_P_TEB), false, false) < 0) goto drop; if (tunnel->collect_md) { struct ip_tunnel_info *info; struct erspan_metadata *md; __be64 tun_id; __be16 flags; tpi->flags |= TUNNEL_KEY; flags = tpi->flags; tun_id = key32_to_tunnel_id(tpi->key); tun_dst = ip_tun_rx_dst(skb, flags, tun_id, sizeof(*md)); if (!tun_dst) return PACKET_REJECT; md = ip_tunnel_info_opts(&tun_dst->u.tun_info); if (!md) return PACKET_REJECT; md->index = index; info = &tun_dst->u.tun_info; info->key.tun_flags |= TUNNEL_ERSPAN_OPT; info->options_len = sizeof(*md); } else { tunnel->index = ntohl(index); } skb_reset_mac_header(skb); ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); return PACKET_RCVD; } drop: kfree_skb(skb); return PACKET_RCVD; }

Contributors

PersonTokensPropCommitsCommitProp
William Tu37398.42%250.00%
Xin Long51.32%125.00%
Haishuang Yan10.26%125.00%
Total379100.00%4100.00%


static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, struct ip_tunnel_net *itn, int hdr_len, bool raw_proto) { struct metadata_dst *tun_dst = NULL; const struct iphdr *iph; struct ip_tunnel *tunnel; iph = ip_hdr(skb); tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, iph->saddr, iph->daddr, tpi->key); if (tunnel) { if (__iptunnel_pull_header(skb, hdr_len, tpi->proto, raw_proto, false) < 0) goto drop; if (tunnel->dev->type != ARPHRD_NONE) skb_pop_mac_header(skb); else skb_reset_mac_header(skb); if (tunnel->collect_md) { __be16 flags; __be64 tun_id; flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY); tun_id = key32_to_tunnel_id(tpi->key); tun_dst = ip_tun_rx_dst(skb, flags, tun_id, 0); if (!tun_dst) return PACKET_REJECT; } ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); return PACKET_RCVD; } return PACKET_NEXT; drop: kfree_skb(skb); return PACKET_RCVD; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar10950.46%430.77%
Jiri Benc6027.78%323.08%
Linus Torvalds (pre-git)3616.67%17.69%
Timo Teräs73.24%215.38%
David S. Miller20.93%17.69%
Stephen Hemminger10.46%17.69%
Amir Vadai10.46%17.69%
Total216100.00%13100.00%


static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, int hdr_len) { struct net *net = dev_net(skb->dev); struct ip_tunnel_net *itn; int res; if (tpi->proto == htons(ETH_P_TEB)) itn = net_generic(net, gre_tap_net_id); else itn = net_generic(net, ipgre_net_id); res = __ipgre_rcv(skb, tpi, itn, hdr_len, false); if (res == PACKET_NEXT && tpi->proto == htons(ETH_P_TEB)) { /* ipgre tunnels in collect metadata mode should receive * also ETH_P_TEB traffic. */ itn = net_generic(net, ipgre_net_id); res = __ipgre_rcv(skb, tpi, itn, hdr_len, true); } return res; }

Contributors

PersonTokensPropCommitsCommitProp
Jiri Benc12999.23%266.67%
Timo Teräs10.77%133.33%
Total130100.00%3100.00%


static int gre_rcv(struct sk_buff *skb) { struct tnl_ptk_info tpi; bool csum_err = false; int hdr_len; #ifdef CONFIG_NET_IPGRE_BROADCAST if (ipv4_is_multicast(ip_hdr(skb)->daddr)) { /* Looped back packet, drop it! */ if (rt_is_output_route(skb_rtable(skb))) goto drop; } #endif hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), 0); if (hdr_len < 0) goto drop; if (unlikely(tpi.proto == htons(ETH_P_ERSPAN))) { if (erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) return 0; } if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) return 0; icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); drop: kfree_skb(skb); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar10265.38%114.29%
William Tu3522.44%114.29%
Jiri Benc85.13%228.57%
Haishuang Yan53.21%114.29%
Tom Herbert42.56%114.29%
Eric Dumazet21.28%114.29%
Total156100.00%7100.00%


static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, const struct iphdr *tnl_params, __be16 proto) { struct ip_tunnel *tunnel = netdev_priv(dev); if (tunnel->parms.o_flags & TUNNEL_SEQ) tunnel->o_seqno++; /* Push GRE header. */ gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, proto, tunnel->parms.o_key, htonl(tunnel->o_seqno)); ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar9398.94%150.00%
Tom Herbert11.06%150.00%
Total94100.00%2100.00%


static int gre_handle_offloads(struct sk_buff *skb, bool csum) { return iptunnel_handle_offloads(skb, csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar2596.15%150.00%
Alexander Duyck13.85%150.00%
Total26100.00%2100.00%


static struct rtable *gre_get_rt(struct sk_buff *skb, struct net_device *dev, struct flowi4 *fl, const struct ip_tunnel_key *key) { struct net *net = dev_net(dev); memset(fl, 0, sizeof(*fl)); fl->daddr = key->u.ipv4.dst; fl->saddr = key->u.ipv4.src; fl->flowi4_tos = RT_TOS(key->tos); fl->flowi4_mark = skb->mark; fl->flowi4_proto = IPPROTO_GRE; return ip_route_output_key(net, fl); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar109100.00%2100.00%
Total109100.00%2100.00%


static struct rtable *prepare_fb_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi4 *fl, int tunnel_hlen) { struct ip_tunnel_info *tun_info; const struct ip_tunnel_key *key; struct rtable *rt = NULL; int min_headroom; bool use_cache; int err; tun_info = skb_tunnel_info(skb); key = &tun_info->key; use_cache = ip_tunnel_dst_cache_usable(skb, tun_info); if (use_cache) rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl->saddr); if (!rt) { rt = gre_get_rt(skb, dev, fl, key); if (IS_ERR(rt)) goto err_free_skb; if (use_cache) dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst, fl->saddr); } min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + tunnel_hlen + sizeof(struct iphdr); if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) { int head_delta = SKB_DATA_ALIGN(min_headroom - skb_headroom(skb) + 16); err = pskb_expand_head(skb, max_t(int, head_delta, 0), 0, GFP_ATOMIC); if (unlikely(err)) goto err_free_rt; } return rt; err_free_rt: ip_rt_put(rt); err_free_skb: kfree_skb(skb); dev->stats.tx_dropped++; return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar15559.85%228.57%
Paolo Abeni4115.83%114.29%
William Tu4115.83%114.29%
Daniel Borkmann207.72%114.29%
Eric Dumazet10.39%114.29%
Jiri Benc10.39%114.29%
Total259100.00%7100.00%


static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev, __be16 proto) { struct ip_tunnel_info *tun_info; const struct ip_tunnel_key *key; struct rtable *rt = NULL; struct flowi4 fl; int tunnel_hlen; __be16 df, flags; tun_info = skb_tunnel_info(skb); if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || ip_tunnel_info_af(tun_info) != AF_INET)) goto err_free_skb; key = &tun_info->key; tunnel_hlen = gre_calc_hlen(key->tun_flags); rt = prepare_fb_xmit(skb, dev, &fl, tunnel_hlen); if (!rt) return; /* Push Tunnel header. */ if (gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM))) goto err_free_rt; flags = tun_info->key.tun_flags & (TUNNEL_CSUM | TUNNEL_KEY); gre_build_header(skb, tunnel_hlen, flags, proto, tunnel_id_to_key32(tun_info->key.tun_id), 0); df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; iptunnel_xmit(skb->sk, rt, skb, fl.saddr, key->u.ipv4.dst, IPPROTO_GRE, key->tos, key->ttl, df, false); return; err_free_rt: ip_rt_put(rt); err_free_skb: kfree_skb(skb); dev->stats.tx_dropped++; }

Contributors

PersonTokensPropCommitsCommitProp
William Tu11846.83%16.67%
Pravin B Shelar10742.46%213.33%
Jiri Benc83.17%320.00%
Linus Torvalds (pre-git)62.38%16.67%
Tom Herbert41.59%213.33%
Eric Dumazet31.19%213.33%
Pavel Emelyanov20.79%16.67%
Alexander Duyck20.79%16.67%
Nicolas Dichtel10.40%16.67%
Amir Vadai10.40%16.67%
Total252100.00%15100.00%


static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev, __be16 proto) { struct ip_tunnel *tunnel = netdev_priv(dev); struct ip_tunnel_info *tun_info; const struct ip_tunnel_key *key; struct erspan_metadata *md; struct rtable *rt = NULL; bool truncate = false; struct flowi4 fl; int tunnel_hlen; __be16 df; tun_info = skb_tunnel_info(skb); if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || ip_tunnel_info_af(tun_info) != AF_INET)) goto err_free_skb; key = &tun_info->key; /* ERSPAN has fixed 8 byte GRE header */ tunnel_hlen = 8 + sizeof(struct erspanhdr); rt = prepare_fb_xmit(skb, dev, &fl, tunnel_hlen); if (!rt) return; if (gre_handle_offloads(skb, false)) goto err_free_rt; if (skb->len > dev->mtu + dev->hard_header_len) { pskb_trim(skb, dev->mtu + dev->hard_header_len); truncate = true; } md = ip_tunnel_info_opts(tun_info); if (!md) goto err_free_rt; erspan_build_header(skb, tunnel_id_to_key32(key->tun_id), ntohl(md->index), truncate); gre_build_header(skb, 8, TUNNEL_SEQ, htons(ETH_P_ERSPAN), 0, htonl(tunnel->o_seqno++)); df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; iptunnel_xmit(skb->sk, rt, skb, fl.saddr, key->u.ipv4.dst, IPPROTO_GRE, key->tos, key->ttl, df, false); return; err_free_rt: ip_rt_put(rt); err_free_skb: kfree_skb(skb); dev->stats.tx_dropped++; }

Contributors

PersonTokensPropCommitsCommitProp
William Tu318100.00%2100.00%
Total318100.00%2100.00%


static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) { struct ip_tunnel_info *info = skb_tunnel_info(skb); struct rtable *rt; struct flowi4 fl4; if (ip_tunnel_info_af(info) != AF_INET) return -EINVAL; rt = gre_get_rt(skb, dev, &fl4, &info->key); if (IS_ERR(rt)) return PTR_ERR(rt); ip_rt_put(rt); info->key.u.ipv4.src = fl4.saddr; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar100100.00%1100.00%
Total100100.00%1100.00%


static netdev_tx_t ipgre_xmit(struct sk_buff *skb, struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); const struct iphdr *tnl_params; if (tunnel->collect_md) { gre_fb_xmit(skb, dev, skb->protocol); return NETDEV_TX_OK; } if (dev->header_ops) { /* Need space for new headers */ if (skb_cow_head(skb, dev->needed_headroom - (tunnel->hlen + sizeof(struct iphdr)))) goto free_skb; tnl_params = (const struct iphdr *)skb->data; /* Pull skb since ip_tunnel_xmit() needs skb->data pointing * to gre header. */ skb_pull(skb, tunnel->hlen + sizeof(struct iphdr)); skb_reset_mac_header(skb); } else { if (skb_cow_head(skb, dev->needed_headroom)) goto free_skb; tnl_params = &tunnel->parms.iph; } if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) goto free_skb; __gre_xmit(skb, dev, tnl_params, skb->protocol); return NETDEV_TX_OK; free_skb: kfree_skb(skb); dev->stats.tx_dropped++; return NETDEV_TX_OK; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar12260.10%218.18%
Linus Torvalds (pre-git)2914.29%218.18%
Timo Teräs2411.82%19.09%
Stephen Hemminger136.40%19.09%
Ville Nuorvala62.96%19.09%
Jiri Benc41.97%19.09%
Alexander Duyck31.48%19.09%
Eric Dumazet20.99%218.18%
Total203100.00%11100.00%


static inline u8 tos_to_cos(u8 tos) { u8 dscp, cos; dscp = tos >> 2; cos = dscp >> 3; return cos; }

Contributors

PersonTokensPropCommitsCommitProp
William Tu2996.67%150.00%
Pravin B Shelar13.33%150.00%
Total30100.00%2100.00%


static void erspan_build_header(struct sk_buff *skb, __be32 id, u32 index, bool truncate) { struct iphdr *iphdr = ip_hdr(skb); struct ethhdr *eth = eth_hdr(skb); enum erspan_encap_type enc_type; struct erspanhdr *ershdr; struct qtag_prefix { __be16 eth_type; __be16 tci; } *qp; u16 vlan_tci = 0; enc_type = ERSPAN_ENCAP_NOVLAN; /* If mirrored packet has vlan tag, extract tci and * perserve vlan header in the mirrored frame. */ if (eth->h_proto == htons(ETH_P_8021Q)) { qp = (struct qtag_prefix *)(skb->data + 2 * ETH_ALEN); vlan_tci = ntohs(qp->tci); enc_type = ERSPAN_ENCAP_INFRAME; } skb_push(skb, sizeof(*ershdr)); ershdr = (struct erspanhdr *)skb->data; memset(ershdr, 0, sizeof(*ershdr)); ershdr->ver_vlan = htons((vlan_tci & VLAN_MASK) | (ERSPAN_VERSION << VER_OFFSET)); ershdr->session_id = htons((u16)(ntohl(id) & ID_MASK) | ((tos_to_cos(iphdr->tos) << COS_OFFSET) & COS_MASK) | (enc_type << EN_OFFSET & EN_MASK) | ((truncate << T_OFFSET) & T_MASK)); ershdr->md.index = htonl(index & INDEX_MASK); }

Contributors

PersonTokensPropCommitsCommitProp
William Tu18779.91%112.50%
Pravin B Shelar3615.38%337.50%
Eric Dumazet93.85%225.00%
Linus Torvalds (pre-git)10.43%112.50%
Jiri Benc10.43%112.50%
Total234100.00%8100.00%


static netdev_tx_t erspan_xmit(struct sk_buff *skb, struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); bool truncate = false; if (tunnel->collect_md) { erspan_fb_xmit(skb, dev, skb->protocol); return NETDEV_TX_OK; } if (gre_handle_offloads(skb, false)) goto free_skb; if (skb_cow_head(skb, dev->needed_headroom)) goto free_skb; if (skb->len > dev->mtu + dev->hard_header_len) { pskb_trim(skb, dev->mtu + dev->hard_header_len); truncate = true; } /* Push ERSPAN header */ erspan_build_header(skb, tunnel->parms.o_key, tunnel->index, truncate); tunnel->parms.o_flags &= ~TUNNEL_KEY; __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_ERSPAN)); return NETDEV_TX_OK; free_skb: kfree_skb(skb); dev->stats.tx_dropped++; return NETDEV_TX_OK; }

Contributors

PersonTokensPropCommitsCommitProp
William Tu17497.75%360.00%
Linus Torvalds (pre-git)31.69%120.00%
Adrian Bunk10.56%120.00%
Total178100.00%5100.00%


static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); if (tunnel->collect_md) { gre_fb_xmit(skb, dev, htons(ETH_P_TEB)); return NETDEV_TX_OK; } if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) goto free_skb; if (skb_cow_head(skb, dev->needed_headroom)) goto free_skb; __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB)); return NETDEV_TX_OK; free_skb: kfree_skb(skb); dev->stats.tx_dropped++; return NETDEV_TX_OK; }

Contributors

PersonTokensPropCommitsCommitProp
William Tu124100.00%1100.00%
Total124100.00%1100.00%


static void ipgre_link_update(struct net_device *dev, bool set_mtu) { struct ip_tunnel *tunnel = netdev_priv(dev); int len; len = tunnel->tun_hlen; tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); len = tunnel->tun_hlen - len; tunnel->hlen = tunnel->hlen + len; dev->needed_headroom = dev->needed_headroom + len; if (set_mtu) dev->mtu = max_t(int, dev->mtu - len, 68); if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || tunnel->encap.type == TUNNEL_ENCAP_NONE) { dev->features |= NETIF_F_GSO_SOFTWARE; dev->hw_features |= NETIF_F_GSO_SOFTWARE; } dev->features |= NETIF_F_LLTX; } }

Contributors

PersonTokensPropCommitsCommitProp
Xin Long151100.00%1100.00%
Total151100.00%1100.00%


static int ipgre_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) { struct ip_tunnel_parm p; int err; if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) return -EFAULT; if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || p.iph.ihl != 5 || (p.iph.frag_off & htons(~IP_DF)) || ((p.i_flags | p.o_flags) & (GRE_VERSION | GRE_ROUTING))) return -EINVAL; } p.i_flags = gre_flags_to_tnl_flags(p.i_flags); p.o_flags = gre_flags_to_tnl_flags(p.o_flags); err = ip_tunnel_ioctl(dev, &p, cmd); if (err) return err; if (cmd == SIOCCHGTUNNEL) { struct ip_tunnel *t = netdev_priv(dev); t->parms.i_flags = p.i_flags; t->parms.o_flags = p.o_flags; if (strcmp(dev->rtnl_link_ops->kind, "erspan")) ipgre_link_update(dev, true); } p.i_flags = gre_tnl_flags_to_gre_flags(p.i_flags); p.o_flags = gre_tnl_flags_to_gre_flags(p.o_flags); if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) return -EFAULT; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar14854.81%17.69%
Xin Long6122.59%17.69%
Linus Torvalds (pre-git)176.30%215.38%
Américo Wang114.07%17.69%
Eric Dumazet93.33%215.38%
William Tu82.96%17.69%
Pavel Emelyanov51.85%17.69%
Ville Nuorvala51.85%17.69%
David S. Miller31.11%17.69%
Tom Herbert20.74%17.69%
Stephen Hemminger10.37%17.69%
Total270100.00%13100.00%

/* Nice toy. Unfortunately, useless in real life :-) It allows to construct virtual multiprotocol broadcast "LAN" over the Internet, provided multicast routing is tuned. I have no idea was this bicycle invented before me, so that I had to set ARPHRD_IPGRE to a random value. I have an impression, that Cisco could make something similar, but this feature is apparently missing in IOS<=11.2(8). I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks with broadcast 224.66.66.66. If you have access to mbone, play with me :-) ping -t 255 224.66.66.66 If nobody answers, mbone does not work. ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 ip addr add 10.66.66.<somewhat>/24 dev Universe ifconfig Universe up ifconfig Universe add fe80::<Your_real_addr>/10 ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 ftp 10.66.66.66 ... ftp fec0:6666:6666::193.233.7.65 ... */
static int ipgre_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, const void *daddr, const void *saddr, unsigned int len) { struct ip_tunnel *t = netdev_priv(dev); struct iphdr *iph; struct gre_base_hdr *greh; iph = skb_push(skb, t->hlen + sizeof(*iph)); greh = (struct gre_base_hdr *)(iph+1); greh->flags = gre_tnl_flags_to_gre_flags(t->parms.o_flags); greh->protocol = htons(type); memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); /* Set the source hardware address. */ if (saddr) memcpy(&iph->saddr, saddr, 4); if (daddr) memcpy(&iph->daddr, daddr, 4); if (iph->daddr) return t->hlen + sizeof(*iph); return -(t->hlen + sizeof(*iph)); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar13270.21%112.50%
Pavel Emelyanov3719.68%225.00%
Timo Teräs63.19%112.50%
Eric Dumazet52.66%112.50%
Herbert Xu42.13%112.50%
Eric W. Biedermann31.60%112.50%
Tom Herbert10.53%112.50%
Total188100.00%8100.00%


static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) { const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); memcpy(haddr, &iph->saddr, 4); return 4; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar3367.35%125.00%
Pavel Emelyanov1428.57%250.00%
Eric Dumazet24.08%125.00%
Total49100.00%4100.00%

static const struct header_ops ipgre_header_ops = { .create = ipgre_header, .parse = ipgre_header_parse, }; #ifdef CONFIG_NET_IPGRE_BROADCAST
static int ipgre_open(struct net_device *dev) { struct ip_tunnel *t = netdev_priv(dev); if (ipv4_is_multicast(t->parms.iph.daddr)) { struct flowi4 fl4; struct rtable *rt; rt = ip_route_output_gre(t->net, &fl4, t->parms.iph.daddr, t->parms.iph.saddr, t->parms.o_key, RT_TOS(t->parms.iph.tos), t->parms.link); if (IS_ERR(rt)) return -EADDRNOTAVAIL; dev = rt->dst.dev; ip_rt_put(rt); if (!__in_dev_get_rtnl(dev)) return -EADDRNOTAVAIL; t->mlink = dev->ifindex; ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar12477.99%19.09%
Pavel Emelyanov95.66%218.18%
Herbert Xu95.66%19.09%
David S. Miller85.03%218.18%
Nicolas Dichtel31.89%19.09%
Linus Torvalds (pre-git)31.89%19.09%
Stephen Hemminger10.63%19.09%
Al Viro10.63%19.09%
Ian Morris10.63%19.09%
Total159100.00%11100.00%


static int ipgre_close(struct net_device *dev) { struct ip_tunnel *t = netdev_priv(dev); if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { struct in_device *in_dev; in_dev = inetdev_by_index(t->net, t->mlink); if (in_dev) ip_mc_dec_group(in_dev, t->parms.iph.daddr); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar5064.10%133.33%
Herbert Xu2532.05%133.33%
Nicolas Dichtel33.85%133.33%
Total78100.00%3100.00%

#endif static const struct net_device_ops ipgre_netdev_ops = { .ndo_init = ipgre_tunnel_init, .ndo_uninit = ip_tunnel_uninit, #ifdef CONFIG_NET_IPGRE_BROADCAST .ndo_open = ipgre_open, .ndo_stop = ipgre_close, #endif .ndo_start_xmit = ipgre_xmit, .ndo_do_ioctl = ipgre_tunnel_ioctl, .ndo_change_mtu = ip_tunnel_change_mtu, .ndo_get_stats64 = ip_tunnel_get_stats64, .ndo_get_iflink = ip_tunnel_get_iflink, }; #define GRE_FEATURES (NETIF_F_SG | \ NETIF_F_FRAGLIST | \ NETIF_F_HIGHDMA | \ NETIF_F_HW_CSUM)
static void ipgre_tunnel_setup(struct net_device *dev) { dev->netdev_ops = &ipgre_netdev_ops; dev->type = ARPHRD_IPGRE; ip_tunnel_setup(dev, ipgre_net_id); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar2167.74%133.33%
Nicolas Dichtel619.35%133.33%
Herbert Xu412.90%133.33%
Total31100.00%3100.00%


static void __gre_tunnel_init(struct net_device *dev) { struct ip_tunnel *tunnel; int t_hlen; tunnel = netdev_priv(dev); tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); tunnel->parms.iph.protocol = IPPROTO_GRE; tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; t_hlen = tunnel->hlen + sizeof(struct iphdr); dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4; dev->mtu = ETH_DATA_LEN - t_hlen - 4; dev->features |= GRE_FEATURES; dev->hw_features |= GRE_FEATURES; if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { /* TCP offload with GRE SEQ is not supported, nor * can we support 2 levels of outer headers requiring * an update. */ if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || (tunnel->encap.type == TUNNEL_ENCAP_NONE)) { dev->features |= NETIF_F_GSO_SOFTWARE; dev->hw_features |= NETIF_F_GSO_SOFTWARE; } /* Can use a lockless transmit, unless we generate * output sequences */ dev->features |= NETIF_F_LLTX; } }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar7344.24%110.00%
Tom Herbert2917.58%220.00%
Herbert Xu2615.76%110.00%
Alexander Duyck2615.76%110.00%
Linus Torvalds (pre-git)42.42%110.00%
Pavel Emelyanov31.82%110.00%
Patrick McHardy21.21%110.00%
Adrian Bunk10.61%110.00%
David S. Miller10.61%110.00%
Total165100.00%10100.00%


static int ipgre_tunnel_init(struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); struct iphdr *iph = &tunnel->parms.iph; __gre_tunnel_init(dev); memcpy(dev->dev_addr, &iph->saddr, 4); memcpy(dev->broadcast, &iph->daddr, 4); dev->flags = IFF_NOARP; netif_keep_dst(dev); dev->addr_len = 4; if (iph->daddr && !tunnel->collect_md) { #ifdef CONFIG_NET_IPGRE_BROADCAST if (ipv4_is_multicast(iph->daddr)) { if (!iph->saddr) return -EINVAL; dev->flags = IFF_BROADCAST; dev->header_ops = &ipgre_header_ops; } #endif } else if (!tunnel->collect_md) { dev->header_ops = &ipgre_header_ops; } return ip_tunnel_init(dev); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar9459.12%120.00%
Herbert Xu3421.38%120.00%
Eric Dumazet1610.06%240.00%
Jiri Benc159.43%120.00%
Total159100.00%5100.00%

static const struct gre_protocol ipgre_protocol = { .handler = gre_rcv, .err_handler = gre_err, };
static int __net_init ipgre_init_net(struct net *net) { return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar25100.00%1100.00%
Total25100.00%1100.00%


static void __net_exit ipgre_exit_batch_net(struct list_head *list_net) { ip_tunnel_delete_nets(list_net, ipgre_net_id, &ipgre_link_ops); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar1463.64%133.33%
Eric Dumazet522.73%133.33%
Nicolas Dichtel313.64%133.33%
Total22100.00%3100.00%

static struct pernet_operations ipgre_net_ops = { .init = ipgre_init_net, .exit_batch = ipgre_exit_batch_net, .id = &ipgre_net_id, .size = sizeof(struct ip_tunnel_net), };
static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { __be16 flags; if (!data) return 0; flags = 0; if (data[IFLA_GRE_IFLAGS]) flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); if (data[IFLA_GRE_OFLAGS]) flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); if (flags & (GRE_VERSION|GRE_ROUTING)) return -EINVAL; if (data[IFLA_GRE_COLLECT_METADATA] && data[IFLA_GRE_ENCAP_TYPE] && nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) return -EINVAL; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar7565.22%240.00%
Jiri Benc2521.74%120.00%
Herbert Xu108.70%120.00%
Matthias Schiffer54.35%120.00%
Total115100.00%5100.00%


static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { __be32 daddr; if (tb[IFLA_ADDRESS]) { if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) return -EINVAL; if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) return -EADDRNOTAVAIL; } if (!data) goto out; if (data[IFLA_GRE_REMOTE]) { memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); if (!daddr) return -EINVAL; } out: return ipgre_tunnel_validate(tb, data, extack); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar6452.03%120.00%
Herbert Xu4939.84%240.00%
Matthias Schiffer75.69%120.00%
Eric Dumazet32.44%120.00%
Total123100.00%5100.00%


static int erspan_validate(struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { __be16 flags = 0; int ret; if (!data) return 0; ret = ipgre_tap_validate(tb, data, extack); if (ret) return ret; /* ERSPAN should only have GRE sequence and key flag */ if (data[IFLA_GRE_OFLAGS]) flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); if (data[IFLA_GRE_IFLAGS]) flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); if (!data[IFLA_GRE_COLLECT_METADATA] && flags != (GRE_SEQ | GRE_KEY)) return -EINVAL; /* ERSPAN Session ID only has 10-bit. Since we reuse * 32-bit key field as ID, check it's range. */ if (data[IFLA_GRE_IKEY] && (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) return -EINVAL; if (data[IFLA_GRE_OKEY] && (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) return -EINVAL; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
William Tu170100.00%2100.00%
Total170100.00%2100.00%


static int ipgre_netlink_parms(struct net_device *dev, struct nlattr *data[], struct nlattr *tb[], struct ip_tunnel_parm *parms, __u32 *fwmark) { struct ip_tunnel *t = netdev_priv(dev); memset(parms, 0, sizeof(*parms)); parms->iph.protocol = IPPROTO_GRE; if (!data) return 0; if (data[IFLA_GRE_LINK]) parms->link = nla_get_u32(data[IFLA_GRE_LINK]); if (data[IFLA_GRE_IFLAGS]) parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS])); if (data[IFLA_GRE_OFLAGS]) parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS])); if (data[IFLA_GRE_IKEY]) parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); if (data[IFLA_GRE_OKEY]) parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); if (data[IFLA_GRE_LOCAL]) parms->iph.saddr = nla_get_in_addr(data[IFLA_GRE_LOCAL]); if (data[IFLA_GRE_REMOTE]) parms->iph.daddr = nla_get_in_addr(data[IFLA_GRE_REMOTE]); if (data[IFLA_GRE_TTL]) parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); if (data[IFLA_GRE_TOS]) parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) { if (t->ignore_df) return -EINVAL; parms->iph.frag_off = htons(IP_DF); } if (data[IFLA_GRE_COLLECT_METADATA]) { t->collect_md = true; if (dev->type == ARPHRD_IPGRE) dev->type = ARPHRD_NONE; } if (data[IFLA_GRE_IGNORE_DF]) { if (nla_get_u8(data[IFLA_GRE_IGNORE_DF]) && (parms->iph.frag_off & htons(IP_DF))) return -EINVAL; t->ignore_df = !!nla_get_u8(data[IFLA_GRE_IGNORE_DF]); } if (data[IFLA_GRE_FWMARK]) *fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); if (data[IFLA_GRE_ERSPAN_INDEX]) { t->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); if (t->index & ~INDEX_MASK) return -EINVAL; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar19745.92%222.22%
Herbert Xu8118.88%222.22%
Philip A. Prindeville7717.95%111.11%
William Tu409.32%111.11%
Craig Gallek184.20%111.11%
Jiri Benc163.73%222.22%
Total429100.00%9100.00%

/* This function returns true when ENCAP attributes are present in the nl msg */
static bool ipgre_netlink_encap_parms(struct nlattr *data[], struct ip_tunnel_encap *ipencap) { bool ret = false; memset(ipencap, 0, sizeof(*ipencap)); if (!data) return ret; if (data[IFLA_GRE_ENCAP_TYPE]) { ret = true; ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); } if (data[IFLA_GRE_ENCAP_FLAGS]) { ret = true; ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); } if (data[IFLA_GRE_ENCAP_SPORT]) { ret = true; ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); } if (data[IFLA_GRE_ENCAP_DPORT]) { ret = true; ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Tom Herbert14498.63%150.00%
Sabrina Dubroca21.37%150.00%
Total146100.00%2100.00%


static int gre_tap_init(struct net_device *dev) { __gre_tunnel_init(dev); dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; netif_keep_dst(dev); return ip_tunnel_init(dev); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar1545.45%125.00%
Herbert Xu721.21%125.00%
Stephen Hemminger618.18%125.00%
Xin Long515.15%125.00%
Total33100.00%4100.00%

static const struct net_device_ops gre_tap_netdev_ops = { .ndo_init = gre_tap_init, .ndo_uninit = ip_tunnel_uninit, .ndo_start_xmit = gre_tap_xmit, .ndo_set_mac_address = eth_mac_addr, .ndo_validate_addr = eth_validate_addr, .ndo_change_mtu = ip_tunnel_change_mtu, .ndo_get_stats64 = ip_tunnel_get_stats64, .ndo_get_iflink = ip_tunnel_get_iflink, .ndo_fill_metadata_dst = gre_fill_metadata_dst, };
static int erspan_tunnel_init(struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); int t_hlen; tunnel->tun_hlen = 8; tunnel->parms.iph.protocol = IPPROTO_GRE; tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + sizeof(struct erspanhdr); t_hlen = tunnel->hlen + sizeof(struct iphdr); dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4; dev->mtu = ETH_DATA_LEN - t_hlen - 4; dev->features |= GRE_FEATURES; dev->hw_features |= GRE_FEATURES; dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; netif_keep_dst(dev); return ip_tunnel_init(dev); }

Contributors

PersonTokensPropCommitsCommitProp
William Tu9882.35%133.33%
Xin Long2117.65%266.67%
Total119100.00%3100.00%

static const struct net_device_ops erspan_netdev_ops = { .ndo_init = erspan_tunnel_init, .ndo_uninit = ip_tunnel_uninit, .ndo_start_xmit = erspan_xmit, .ndo_set_mac_address = eth_mac_addr, .ndo_validate_addr = eth_validate_addr, .ndo_change_mtu = ip_tunnel_change_mtu, .ndo_get_stats64 = ip_tunnel_get_stats64, .ndo_get_iflink = ip_tunnel_get_iflink, .ndo_fill_metadata_dst = gre_fill_metadata_dst, };
static void ipgre_tap_setup(struct net_device *dev) { ether_setup(dev); dev->max_mtu = 0; dev->netdev_ops = &gre_tap_netdev_ops; dev->priv_flags &= ~IFF_TX_SKB_SHARING; dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; ip_tunnel_setup(dev, gre_tap_net_id); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar1734.69%120.00%
Herbert Xu1326.53%120.00%
Jiri Benc714.29%120.00%
Xin Long612.24%120.00%
Stephen Hemminger612.24%120.00%
Total49100.00%5100.00%


static int ipgre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { struct ip_tunnel_parm p; struct ip_tunnel_encap ipencap; __u32 fwmark = 0; int err; if (ipgre_netlink_encap_parms(data, &ipencap)) { struct ip_tunnel *t = netdev_priv(dev); err = ip_tunnel_encap_setup(t, &ipencap); if (err < 0) return err; } err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark); if (err < 0) return err; return ip_tunnel_newlink(dev, tb, &p, fwmark); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar5441.86%228.57%
Tom Herbert4333.33%114.29%
Philip A. Prindeville1612.40%114.29%
Craig Gallek107.75%114.29%
Matthias Schiffer53.88%114.29%
Herbert Xu10.78%114.29%
Total129100.00%7100.00%


static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { struct ip_tunnel *t = netdev_priv(dev); struct ip_tunnel_encap ipencap; __u32 fwmark = t->fwmark; struct ip_tunnel_parm p; int err; if (ipgre_netlink_encap_parms(data, &ipencap)) { err = ip_tunnel_encap_setup(t, &ipencap); if (err < 0) return err; } err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark); if (err < 0) return err; err = ip_tunnel_changelink(dev, tb, &p, fwmark); if (err < 0) return err; t->parms.i_flags = p.i_flags; t->parms.o_flags = p.o_flags; if (strcmp(dev->rtnl_link_ops->kind, "erspan")) ipgre_link_update(dev, !tb[IFLA_MTU]); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Xin Long6233.88%112.50%
Pravin B Shelar4424.04%225.00%
Tom Herbert3217.49%112.50%
Craig Gallek2212.02%112.50%
Philip A. Prindeville168.74%112.50%
Matthias Schiffer52.73%112.50%
Herbert Xu21.09%112.50%
Total183100.00%8100.00%


static size_t ipgre_get_size(const struct net_device *dev) { return /* IFLA_GRE_LINK */ nla_total_size(4) + /* IFLA_GRE_IFLAGS */ nla_total_size(2) + /* IFLA_GRE_OFLAGS */ nla_total_size(2) + /* IFLA_GRE_IKEY */ nla_total_size(4) + /* IFLA_GRE_OKEY */ nla_total_size(4) + /* IFLA_GRE_LOCAL */ nla_total_size(4) + /* IFLA_GRE_REMOTE */ nla_total_size(4) + /* IFLA_GRE_TTL */ nla_total_size(1) + /* IFLA_GRE_TOS */ nla_total_size(1) + /* IFLA_GRE_PMTUDISC */ nla_total_size(1) + /* IFLA_GRE_ENCAP_TYPE */ nla_total_size(2) + /* IFLA_GRE_ENCAP_FLAGS */ nla_total_size(2) + /* IFLA_GRE_ENCAP_SPORT */ nla_total_size(2) + /* IFLA_GRE_ENCAP_DPORT */ nla_total_size(2) + /* IFLA_GRE_COLLECT_METADATA */ nla_total_size(0) + /* IFLA_GRE_IGNORE_DF */ nla_total_size(1) + /* IFLA_GRE_FWMARK */ nla_total_size(4) + /* IFLA_GRE_ERSPAN_INDEX */ nla_total_size(4) + 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu7560.98%116.67%
Tom Herbert2419.51%116.67%
Craig Gallek64.88%116.67%
Pravin B Shelar64.88%116.67%
William Tu64.88%116.67%
Philip A. Prindeville64.88%116.67%
Total123100.00%6100.00%


static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) { struct ip_tunnel *t = netdev_priv(dev); struct ip_tunnel_parm *p = &t->parms; if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || nla_put_be16(skb, IFLA_GRE_IFLAGS, gre_tnl_flags_to_gre_flags(p->i_flags)) || nla_put_be16(skb, IFLA_GRE_OFLAGS, gre_tnl_flags_to_gre_flags(p->o_flags)) || nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || nla_put_in_addr(skb, IFLA_GRE_LOCAL, p->iph.saddr) || nla_put_in_addr(skb, IFLA_GRE_REMOTE, p->iph.daddr) || nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) || nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) || nla_put_u8(skb, IFLA_GRE_PMTUDISC, !!(p->iph.frag_off & htons(IP_DF))) || nla_put_u32(skb, IFLA_GRE_FWMARK, t->fwmark)) goto nla_put_failure; if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, t->encap.type) || nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, t->encap.sport) || nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, t->encap.dport) || nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, t->encap.flags)) goto nla_put_failure; if (nla_put_u8(skb, IFLA_GRE_IGNORE_DF, t->ignore_df)) goto nla_put_failure; if (t->collect_md) { if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) goto nla_put_failure; } if (t->index) if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, t->index)) goto nla_put_failure; return 0; nla_put_failure: return -EMSGSIZE; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu14145.19%17.69%
Tom Herbert5718.27%323.08%
William Tu4113.14%17.69%
David S. Miller237.37%17.69%
Philip A. Prindeville165.13%17.69%
Pravin B Shelar154.81%215.38%
Craig Gallek113.53%17.69%
Patrick McHardy41.28%17.69%
Sabrina Dubroca20.64%17.69%
Jiri Benc20.64%17.69%
Total312100.00%13100.00%


static void erspan_setup(struct net_device *dev) { ether_setup(dev); dev->netdev_ops = &erspan_netdev_ops; dev->priv_flags &= ~IFF_TX_SKB_SHARING; dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; ip_tunnel_setup(dev, erspan_net_id); }

Contributors

PersonTokensPropCommitsCommitProp
William Tu4093.02%133.33%
Pravin B Shelar24.65%133.33%
Herbert Xu12.33%133.33%
Total43100.00%3100.00%

static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { [IFLA_GRE_LINK] = { .type = NLA_U32 }, [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, [IFLA_GRE_IKEY] = { .type = NLA_U32 }, [IFLA_GRE_OKEY] = { .type = NLA_U32 }, [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, [IFLA_GRE_TTL] = { .type = NLA_U8 }, [IFLA_GRE_TOS] = { .type = NLA_U8 }, [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, [IFLA_GRE_IGNORE_DF] = { .type = NLA_U8 }, [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, }; static struct rtnl_link_ops ipgre_link_ops __read_mostly = { .kind = "gre", .maxtype = IFLA_GRE_MAX, .policy = ipgre_policy, .priv_size = sizeof(struct ip_tunnel), .setup = ipgre_tunnel_setup, .validate = ipgre_tunnel_validate, .newlink = ipgre_newlink, .changelink = ipgre_changelink, .dellink = ip_tunnel_dellink, .get_size = ipgre_get_size, .fill_info = ipgre_fill_info, .get_link_net = ip_tunnel_get_link_net, }; static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { .kind = "gretap", .maxtype = IFLA_GRE_MAX, .policy = ipgre_policy, .priv_size = sizeof(struct ip_tunnel), .setup = ipgre_tap_setup, .validate = ipgre_tap_validate, .newlink = ipgre_newlink, .changelink = ipgre_changelink, .dellink = ip_tunnel_dellink, .get_size = ipgre_get_size, .fill_info = ipgre_fill_info, .get_link_net = ip_tunnel_get_link_net, }; static struct rtnl_link_ops erspan_link_ops __read_mostly = { .kind = "erspan", .maxtype = IFLA_GRE_MAX, .policy = ipgre_policy, .priv_size = sizeof(struct ip_tunnel), .setup = erspan_setup, .validate = erspan_validate, .newlink = ipgre_newlink, .changelink = ipgre_changelink, .dellink = ip_tunnel_dellink, .get_size = ipgre_get_size, .fill_info = ipgre_fill_info, .get_link_net = ip_tunnel_get_link_net, };
struct net_device *gretap_fb_dev_create(struct net *net, const char *name, u8 name_assign_type) { struct nlattr *tb[IFLA_MAX + 1]; struct net_device *dev; LIST_HEAD(list_kill); struct ip_tunnel *t; int err; memset(&tb, 0, sizeof(tb)); dev = rtnl_create_link(net, name, name_assign_type, &ipgre_tap_ops, tb); if (IS_ERR(dev)) return dev; /* Configure flow based GRE device. */ t = netdev_priv(dev); t->collect_md = true; err = ipgre_newlink(net, dev, tb, NULL, NULL); if (err < 0) { free_netdev(dev); return ERR_PTR(err); } /* openvswitch users expect packet sizes to be unrestricted, * so set the largest MTU we can. */ err = __ip_tunnel_change_mtu(dev, IP_MAX_MTU, false); if (err) goto out; err = rtnl_configure_link(dev, NULL); if (err < 0) goto out; return dev; out: ip_tunnel_dellink(dev, &list_kill); unregister_netdevice_many(&list_kill); return ERR_PTR(err); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar13065.99%120.00%
Nicolas Dichtel4623.35%240.00%
David Wragg199.64%120.00%
Matthias Schiffer21.02%120.00%
Total197100.00%5100.00%

EXPORT_SYMBOL_GPL(gretap_fb_dev_create);
static int __net_init ipgre_tap_init_net(struct net *net) { return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0"); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar25100.00%2100.00%
Total25100.00%2100.00%


static void __net_exit ipgre_tap_exit_batch_net(struct list_head *list_net) { ip_tunnel_delete_nets(list_net, gre_tap_net_id, &ipgre_tap_ops); }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar1463.64%133.33%
Eric Dumazet522.73%133.33%
Nicolas Dichtel313.64%133.33%
Total22100.00%3100.00%

static struct pernet_operations ipgre_tap_net_ops = { .init = ipgre_tap_init_net, .exit_batch = ipgre_tap_exit_batch_net, .id = &gre_tap_net_id, .size = sizeof(struct ip_tunnel_net), };
static int __net_init erspan_init_net(struct net *net) { return ip_tunnel_init_net(net, erspan_net_id, &erspan_link_ops, "erspan0"); }

Contributors

PersonTokensPropCommitsCommitProp
William Tu25100.00%1100.00%
Total25100.00%1100.00%


static void __net_exit erspan_exit_batch_net(struct list_head *net_list) { ip_tunnel_delete_nets(net_list, erspan_net_id, &erspan_link_ops); }

Contributors

PersonTokensPropCommitsCommitProp
William Tu1777.27%150.00%
Eric Dumazet522.73%150.00%
Total22100.00%2100.00%

static struct pernet_operations erspan_net_ops = { .init = erspan_init_net, .exit_batch = erspan_exit_batch_net, .id = &erspan_net_id, .size = sizeof(struct ip_tunnel_net), };
static int __init ipgre_init(void) { int err; pr_info("GRE over IPv4 tunneling driver\n"); err = register_pernet_device(&ipgre_net_ops); if (err < 0) return err; err = register_pernet_device(&ipgre_tap_net_ops); if (err < 0) goto pnet_tap_failed; err = register_pernet_device(&erspan_net_ops); if (err < 0) goto pnet_erspan_failed; err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); if (err < 0) { pr_info("%s: can't add protocol\n", __func__); goto add_proto_failed; } err = rtnl_link_register(&ipgre_link_ops); if (err < 0) goto rtnl_link_failed; err = rtnl_link_register(&ipgre_tap_ops); if (err < 0) goto tap_ops_failed; err = rtnl_link_register(&erspan_link_ops); if (err < 0) goto erspan_link_failed; return 0; erspan_link_failed: rtnl_link_unregister(&ipgre_tap_ops); tap_ops_failed: rtnl_link_unregister(&ipgre_link_ops); rtnl_link_failed: gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); add_proto_failed: unregister_pernet_device(&erspan_net_ops); pnet_erspan_failed: unregister_pernet_device(&ipgre_tap_net_ops); pnet_tap_failed: unregister_pernet_device(&ipgre_net_ops); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu9345.81%225.00%
William Tu5225.62%225.00%
Pravin B Shelar3316.26%225.00%
Alexey Dobriyan209.85%112.50%
Joe Perches52.46%112.50%
Total203100.00%8100.00%


static void __exit ipgre_fini(void) { rtnl_link_unregister(&ipgre_tap_ops); rtnl_link_unregister(&ipgre_link_ops); rtnl_link_unregister(&erspan_link_ops); gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); unregister_pernet_device(&ipgre_tap_net_ops); unregister_pernet_device(&ipgre_net_ops); unregister_pernet_device(&erspan_net_ops); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu2649.06%233.33%
William Tu1222.64%116.67%
Pravin B Shelar916.98%233.33%
Alexey Dobriyan611.32%116.67%
Total53100.00%6100.00%

module_init(ipgre_init); module_exit(ipgre_fini); MODULE_LICENSE("GPL"); MODULE_ALIAS_RTNL_LINK("gre"); MODULE_ALIAS_RTNL_LINK("gretap"); MODULE_ALIAS_RTNL_LINK("erspan"); MODULE_ALIAS_NETDEV("gre0"); MODULE_ALIAS_NETDEV("gretap0"); MODULE_ALIAS_NETDEV("erspan0");

Overall Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar290035.69%96.77%
William Tu211225.99%53.76%
Herbert Xu89611.03%53.76%
Tom Herbert3874.76%53.76%
Xin Long3113.83%75.26%
Jiri Benc2783.42%129.02%
Linus Torvalds (pre-git)2453.02%75.26%
Eric Dumazet1722.12%1612.03%
Philip A. Prindeville1421.75%10.75%
Pavel Emelyanov911.12%53.76%
Nicolas Dichtel851.05%86.02%
Craig Gallek780.96%10.75%
Stephen Hemminger750.92%86.02%
Paolo Abeni410.50%10.75%
Timo Teräs380.47%43.01%
David S. Miller370.46%43.01%
Alexander Duyck320.39%21.50%
Alexey Dobriyan280.34%21.50%
Patrick McHardy240.30%32.26%
Matthias Schiffer240.30%32.26%
Daniel Borkmann200.25%10.75%
David Wragg190.23%10.75%
Joe Perches120.15%21.50%
Américo Wang110.14%10.75%
Haishuang Yan110.14%21.50%
Ville Nuorvala110.14%10.75%
Duan Jiong70.09%10.75%
Eric W. Biedermann70.09%10.75%
Linus Torvalds50.06%21.50%
Sabrina Dubroca40.05%10.75%
Kris Katterjohn30.04%10.75%
Dmitry Kozlov30.04%10.75%
Randy Dunlap30.04%10.75%
Tejun Heo30.04%10.75%
Adrian Bunk20.02%21.50%
Ian Morris20.02%10.75%
Amir Vadai20.02%10.75%
Hideaki Yoshifuji / 吉藤英明20.02%21.50%
Vasiliy Kulikov10.01%10.75%
Al Viro10.01%10.75%
Total8125100.00%133100.00%
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