cregit-Linux how code gets into the kernel

Release 4.8 net/ipv6/datagram.c

Directory: net/ipv6
/*
 *      common UDP/RAW code
 *      Linux INET6 implementation
 *
 *      Authors:
 *      Pedro Roque             <roque@di.fc.ul.pt>
 *
 *      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.
 */

#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in6.h>
#include <linux/ipv6.h>
#include <linux/route.h>
#include <linux/slab.h>
#include <linux/export.h>

#include <net/ipv6.h>
#include <net/ndisc.h>
#include <net/addrconf.h>
#include <net/transp_v6.h>
#include <net/ip6_route.h>
#include <net/tcp_states.h>
#include <net/dsfield.h>

#include <linux/errqueue.h>
#include <asm/uaccess.h>


static bool ipv6_mapped_addr_any(const struct in6_addr *a) { return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); }

Contributors

PersonTokensPropCommitsCommitProp
max matveevmax matveev2896.55%150.00%
eric dumazeteric dumazet13.45%150.00%
Total29100.00%2100.00%


static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk) { struct inet_sock *inet = inet_sk(sk); struct ipv6_pinfo *np = inet6_sk(sk); memset(fl6, 0, sizeof(*fl6)); fl6->flowi6_proto = sk->sk_protocol; fl6->daddr = sk->sk_v6_daddr; fl6->saddr = np->saddr; fl6->flowi6_oif = sk->sk_bound_dev_if; fl6->flowi6_mark = sk->sk_mark; fl6->fl6_dport = inet->inet_dport; fl6->fl6_sport = inet->inet_sport; fl6->flowlabel = np->flow_label; if (!fl6->flowi6_oif) fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) fl6->flowi6_oif = np->mcast_oif; security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); }

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PersonTokensPropCommitsCommitProp
martin kafai laumartin kafai lau13482.21%125.00%
hideaki yoshifujihideaki yoshifuji2716.56%125.00%
eric dumazeteric dumazet10.61%125.00%
arnaldo carvalho de meloarnaldo carvalho de melo10.61%125.00%
Total163100.00%4100.00%


int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr) { struct ip6_flowlabel *flowlabel = NULL; struct in6_addr *final_p, final; struct ipv6_txoptions *opt; struct dst_entry *dst; struct inet_sock *inet = inet_sk(sk); struct ipv6_pinfo *np = inet6_sk(sk); struct flowi6 fl6; int err = 0; if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) { flowlabel = fl6_sock_lookup(sk, np->flow_label); if (!flowlabel) return -EINVAL; } ip6_datagram_flow_key_init(&fl6, sk); rcu_read_lock(); opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); final_p = fl6_update_dst(&fl6, opt, &final); rcu_read_unlock(); dst = ip6_dst_lookup_flow(sk, &fl6, final_p); if (IS_ERR(dst)) { err = PTR_ERR(dst); goto out; } if (fix_sk_saddr) { if (ipv6_addr_any(&np->saddr)) np->saddr = fl6.saddr; if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { sk->sk_v6_rcv_saddr = fl6.saddr; inet->inet_rcv_saddr = LOOPBACK4_IPV6; if (sk->sk_prot->rehash) sk->sk_prot->rehash(sk); } } ip6_dst_store(sk, dst, ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? &sk->sk_v6_daddr : NULL, #ifdef CONFIG_IPV6_SUBTREES ipv6_addr_equal(&fl6.saddr, &np->saddr) ? &np->saddr : #endif NULL); out: fl6_sock_release(flowlabel); return err; }

Contributors

PersonTokensPropCommitsCommitProp
martin kafai laumartin kafai lau17256.58%216.67%
hideaki yoshifujihideaki yoshifuji9631.58%18.33%
eric dumazeteric dumazet237.57%325.00%
kazunori miyazawakazunori miyazawa30.99%18.33%
arnaud ebalardarnaud ebalard30.99%18.33%
hannes frederic sowahannes frederic sowa20.66%18.33%
david s. millerdavid s. miller20.66%18.33%
brian haleybrian haley20.66%18.33%
max matveevmax matveev10.33%18.33%
Total304100.00%12100.00%


void ip6_datagram_release_cb(struct sock *sk) { struct dst_entry *dst; if (ipv6_addr_v4mapped(&sk->sk_v6_daddr)) return; rcu_read_lock(); dst = __sk_dst_get(sk); if (!dst || !dst->obsolete || dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) { rcu_read_unlock(); return; } rcu_read_unlock(); ip6_datagram_dst_update(sk, false); }

Contributors

PersonTokensPropCommitsCommitProp
martin kafai laumartin kafai lau6380.77%133.33%
hideaki yoshifujihideaki yoshifuji1417.95%133.33%
brian haleybrian haley11.28%133.33%
Total78100.00%3100.00%

EXPORT_SYMBOL_GPL(ip6_datagram_release_cb);
static int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) { struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; struct inet_sock *inet = inet_sk(sk); struct ipv6_pinfo *np = inet6_sk(sk); struct in6_addr *daddr; int addr_type; int err; __be32 fl6_flowlabel = 0; if (usin->sin6_family == AF_INET) { if (__ipv6_only_sock(sk)) return -EAFNOSUPPORT; err = __ip4_datagram_connect(sk, uaddr, addr_len); goto ipv4_connected; } if (addr_len < SIN6_LEN_RFC2133) return -EINVAL; if (usin->sin6_family != AF_INET6) return -EAFNOSUPPORT; if (np->sndflow) fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; addr_type = ipv6_addr_type(&usin->sin6_addr); if (addr_type == IPV6_ADDR_ANY) { /* * connect to self */ usin->sin6_addr.s6_addr[15] = 0x01; } daddr = &usin->sin6_addr; if (addr_type == IPV6_ADDR_MAPPED) { struct sockaddr_in sin; if (__ipv6_only_sock(sk)) { err = -ENETUNREACH; goto out; } sin.sin_family = AF_INET; sin.sin_addr.s_addr = daddr->s6_addr32[3]; sin.sin_port = usin->sin6_port; err = __ip4_datagram_connect(sk, (struct sockaddr *) &sin, sizeof(sin)); ipv4_connected: if (err) goto out; ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); if (ipv6_addr_any(&np->saddr) || ipv6_mapped_addr_any(&np->saddr)) ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &sk->sk_v6_rcv_saddr); if (sk->sk_prot->rehash) sk->sk_prot->rehash(sk); } goto out; } if (__ipv6_addr_needs_scope_id(addr_type)) { if (addr_len >= sizeof(struct sockaddr_in6) && usin->sin6_scope_id) { if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != usin->sin6_scope_id) { err = -EINVAL; goto out; } sk->sk_bound_dev_if = usin->sin6_scope_id; } if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) sk->sk_bound_dev_if = np->mcast_oif; /* Connect to link-local address requires an interface */ if (!sk->sk_bound_dev_if) { err = -EINVAL; goto out; } } sk->sk_v6_daddr = *daddr; np->flow_label = fl6_flowlabel; inet->inet_dport = usin->sin6_port; /* * Check for a route to destination an obtain the * destination cache for it. */ err = ip6_datagram_dst_update(sk, true); if (err) goto out; sk->sk_state = TCP_ESTABLISHED; sk_set_txhash(sk); out: return err; }

Contributors

PersonTokensPropCommitsCommitProp
hideaki yoshifujihideaki yoshifuji38977.18%27.69%
eric dumazeteric dumazet407.94%519.23%
brian haleybrian haley152.98%311.54%
martin kafai laumartin kafai lau122.38%311.54%
kazunori miyazawakazunori miyazawa101.98%13.85%
max matveevmax matveev101.98%13.85%
alexey dobriyanalexey dobriyan61.19%27.69%
tom herberttom herbert50.99%27.69%
david s. millerdavid s. miller40.79%27.69%
venkat yekkiralavenkat yekkirala40.79%13.85%
paolo abenipaolo abeni30.60%13.85%
arnaud ebalardarnaud ebalard30.60%13.85%
hannes frederic sowahannes frederic sowa20.40%13.85%
arnaldo carvalho de meloarnaldo carvalho de melo10.20%13.85%
Total504100.00%26100.00%


int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) { int res; lock_sock(sk); res = __ip6_datagram_connect(sk, uaddr, addr_len); release_sock(sk); return res; }

Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet45100.00%1100.00%
Total45100.00%1100.00%

EXPORT_SYMBOL_GPL(ip6_datagram_connect);
int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, int addr_len) { DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); if (sin6->sin6_family != AF_INET6) return -EAFNOSUPPORT; return ip6_datagram_connect(sk, uaddr, addr_len); }

Contributors

PersonTokensPropCommitsCommitProp
hannes frederic sowahannes frederic sowa51100.00%1100.00%
Total51100.00%1100.00%

EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, u32 info, u8 *payload) { struct ipv6_pinfo *np = inet6_sk(sk); struct icmp6hdr *icmph = icmp6_hdr(skb); struct sock_exterr_skb *serr; if (!np->recverr) return; skb = skb_clone(skb, GFP_ATOMIC); if (!skb) return; skb->protocol = htons(ETH_P_IPV6); serr = SKB_EXT_ERR(skb); serr->ee.ee_errno = err; serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; serr->ee.ee_type = icmph->icmp6_type; serr->ee.ee_code = icmph->icmp6_code; serr->ee.ee_pad = 0; serr->ee.ee_info = info; serr->ee.ee_data = 0; serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - skb_network_header(skb); serr->port = port; __skb_pull(skb, payload - skb->data); skb_reset_transport_header(skb); if (sock_queue_err_skb(sk, skb)) kfree_skb(skb); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git18684.93%112.50%
david s. millerdavid s. miller115.02%112.50%
arnaldo carvalho de meloarnaldo carvalho de melo115.02%337.50%
brian haleybrian haley94.11%112.50%
al viroal viro10.46%112.50%
linus torvaldslinus torvalds10.46%112.50%
Total219100.00%8100.00%


void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) { const struct ipv6_pinfo *np = inet6_sk(sk); struct sock_exterr_skb *serr; struct ipv6hdr *iph; struct sk_buff *skb; if (!np->recverr) return; skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); if (!skb) return; skb->protocol = htons(ETH_P_IPV6); skb_put(skb, sizeof(struct ipv6hdr)); skb_reset_network_header(skb); iph = ipv6_hdr(skb); iph->daddr = fl6->daddr; serr = SKB_EXT_ERR(skb); serr->ee.ee_errno = err; serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; serr->ee.ee_type = 0; serr->ee.ee_code = 0; serr->ee.ee_pad = 0; serr->ee.ee_info = info; serr->ee.ee_data = 0; serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); serr->port = fl6->fl6_dport; __skb_pull(skb, skb_tail_pointer(skb) - skb->data); skb_reset_transport_header(skb); if (sock_queue_err_skb(sk, skb)) kfree_skb(skb); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git18678.81%17.69%
arnaldo carvalho de meloarnaldo carvalho de melo218.90%538.46%
david s. millerdavid s. miller177.20%323.08%
brian haleybrian haley93.81%17.69%
alexey dobriyanalexey dobriyan10.42%17.69%
eric dumazeteric dumazet10.42%17.69%
linus torvaldslinus torvalds10.42%17.69%
Total236100.00%13100.00%


void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) { struct ipv6_pinfo *np = inet6_sk(sk); struct ipv6hdr *iph; struct sk_buff *skb; struct ip6_mtuinfo *mtu_info; if (!np->rxopt.bits.rxpmtu) return; skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); if (!skb) return; skb_put(skb, sizeof(struct ipv6hdr)); skb_reset_network_header(skb); iph = ipv6_hdr(skb); iph->daddr = fl6->daddr; mtu_info = IP6CBMTU(skb); mtu_info->ip6m_mtu = mtu; mtu_info->ip6m_addr.sin6_family = AF_INET6; mtu_info->ip6m_addr.sin6_port = 0; mtu_info->ip6m_addr.sin6_flowinfo = 0; mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; __skb_pull(skb, skb_tail_pointer(skb) - skb->data); skb_reset_transport_header(skb); skb = xchg(&np->rxpmtu, skb); kfree_skb(skb); }

Contributors

PersonTokensPropCommitsCommitProp
brian haleybrian haley19396.02%133.33%
david s. millerdavid s. miller62.99%133.33%
alexey dobriyanalexey dobriyan21.00%133.33%
Total201100.00%3100.00%

/* For some errors we have valid addr_offset even with zero payload and * zero port. Also, addr_offset should be supported if port is set. */
static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) { return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; }

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PersonTokensPropCommitsCommitProp
julian anastasovjulian anastasov41100.00%1100.00%
Total41100.00%1100.00%

/* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. * * At one point, excluding local errors was a quick test to identify icmp/icmp6 * errors. This is no longer true, but the test remained, so the v6 stack, * unlike v4, also honors cmsg requests on all wifi and timestamp errors. * * Timestamp code paths do not initialize the fields expected by cmsg: * the PKTINFO fields in skb->cb[]. Fill those in here. */
static bool ip6_datagram_support_cmsg(struct sk_buff *skb, struct sock_exterr_skb *serr) { if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) return true; if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) return false; if (!skb->dev) return false; if (skb->protocol == htons(ETH_P_IPV6)) IP6CB(skb)->iif = skb->dev->ifindex; else PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex; return true; }

Contributors

PersonTokensPropCommitsCommitProp
willem de bruijnwillem de bruijn101100.00%2100.00%
Total101100.00%2100.00%

/* * Handle MSG_ERRQUEUE */
int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) { struct ipv6_pinfo *np = inet6_sk(sk); struct sock_exterr_skb *serr; struct sk_buff *skb; DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); struct { struct sock_extended_err ee; struct sockaddr_in6 offender; } errhdr; int err; int copied; err = -EAGAIN; skb = sock_dequeue_err_skb(sk); if (!skb) goto out; copied = skb->len; if (copied > len) { msg->msg_flags |= MSG_TRUNC; copied = len; } err = skb_copy_datagram_msg(skb, 0, msg, copied); if (unlikely(err)) { kfree_skb(skb); return err; } sock_recv_timestamp(msg, sk, skb); serr = SKB_EXT_ERR(skb); if (sin && ipv6_datagram_support_addr(serr)) { const unsigned char *nh = skb_network_header(skb); sin->sin6_family = AF_INET6; sin->sin6_flowinfo = 0; sin->sin6_port = serr->port; if (skb->protocol == htons(ETH_P_IPV6)) { const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), struct ipv6hdr, daddr); sin->sin6_addr = ip6h->daddr; if (np->sndflow) sin->sin6_flowinfo = ip6_flowinfo(ip6h); sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, IP6CB(skb)->iif); } else { ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), &sin->sin6_addr); sin->sin6_scope_id = 0; } *addr_len = sizeof(*sin); } memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); sin = &errhdr.offender; memset(sin, 0, sizeof(*sin)); if (ip6_datagram_support_cmsg(skb, serr)) { sin->sin6_family = AF_INET6; if (np->rxopt.all) ip6_datagram_recv_common_ctl(sk, msg, skb); if (skb->protocol == htons(ETH_P_IPV6)) { sin->sin6_addr = ipv6_hdr(skb)->saddr; if (np->rxopt.all) ip6_datagram_recv_specific_ctl(sk, msg, skb); sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, IP6CB(skb)->iif); } else { ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &sin->sin6_addr); if (inet_sk(sk)->cmsg_flags) ip_cmsg_recv(msg, skb); } } put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); /* Now we could try to dump offended packet options */ msg->msg_flags |= MSG_ERRQUEUE; err = copied; consume_skb(skb); out: return err; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git32761.47%516.67%
hannes frederic sowahannes frederic sowa519.59%310.00%
hideaki yoshifujihideaki yoshifuji346.39%310.00%
willem de bruijnwillem de bruijn244.51%413.33%
brian haleybrian haley244.51%26.67%
arnaldo carvalho de meloarnaldo carvalho de melo244.51%413.33%
eric dumazeteric dumazet142.63%13.33%
david s. millerdavid s. miller132.44%26.67%
steffen hurrlesteffen hurrle112.07%13.33%
linus torvaldslinus torvalds40.75%13.33%
julian anastasovjulian anastasov30.56%13.33%
al viroal viro10.19%13.33%
ian morrisian morris10.19%13.33%
alexey dobriyanalexey dobriyan10.19%13.33%
Total532100.00%30100.00%

EXPORT_SYMBOL_GPL(ipv6_recv_error); /* * Handle IPV6_RECVPATHMTU */
int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, int *addr_len) { struct ipv6_pinfo *np = inet6_sk(sk); struct sk_buff *skb; struct ip6_mtuinfo mtu_info; DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); int err; int copied; err = -EAGAIN; skb = xchg(&np->rxpmtu, NULL); if (!skb) goto out; copied = skb->len; if (copied > len) { msg->msg_flags |= MSG_TRUNC; copied = len; } err = skb_copy_datagram_msg(skb, 0, msg, copied); if (err) goto out_free_skb; sock_recv_timestamp(msg, sk, skb); memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); if (sin) { sin->sin6_family = AF_INET6; sin->sin6_flowinfo = 0; sin->sin6_port = 0; sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; *addr_len = sizeof(*sin); } put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); err = copied; out_free_skb: kfree_skb(skb); out: return err; }

Contributors

PersonTokensPropCommitsCommitProp
brian haleybrian haley21187.92%116.67%
hannes frederic sowahannes frederic sowa135.42%116.67%
steffen hurrlesteffen hurrle135.42%116.67%
david s. millerdavid s. miller10.42%116.67%
ian morrisian morris10.42%116.67%
alexey dobriyanalexey dobriyan10.42%116.67%
Total240100.00%6100.00%


void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) { struct ipv6_pinfo *np = inet6_sk(sk); bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); if (np->rxopt.bits.rxinfo) { struct in6_pktinfo src_info; if (is_ipv6) { src_info.ipi6_ifindex = IP6CB(skb)->iif; src_info.ipi6_addr = ipv6_hdr(skb)->daddr; } else { src_info.ipi6_ifindex = PKTINFO_SKB_CB(skb