cregit-Linux how code gets into the kernel

Release 4.14 net/ipv4/datagram.c

Directory: net/ipv4
 *      common UDP/RAW code
 *      Linux INET implementation
 * Authors:
 *      Hideaki YOSHIFUJI <>
 *      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/types.h>
#include <linux/module.h>
#include <linux/ip.h>
#include <linux/in.h>
#include <net/ip.h>
#include <net/sock.h>
#include <net/route.h>
#include <net/tcp_states.h>

int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) { struct inet_sock *inet = inet_sk(sk); struct sockaddr_in *usin = (struct sockaddr_in *) uaddr; struct flowi4 *fl4; struct rtable *rt; __be32 saddr; int oif; int err; if (addr_len < sizeof(*usin)) return -EINVAL; if (usin->sin_family != AF_INET) return -EAFNOSUPPORT; sk_dst_reset(sk); oif = sk->sk_bound_dev_if; saddr = inet->inet_saddr; if (ipv4_is_multicast(usin->sin_addr.s_addr)) { if (!oif) oif = inet->mc_index; if (!saddr) saddr = inet->mc_addr; } fl4 = &inet->cork.fl.u.ip4; rt = ip_route_connect(fl4, usin->sin_addr.s_addr, saddr, RT_CONN_FLAGS(sk), oif, sk->sk_protocol, inet->inet_sport, usin->sin_port, sk); if (IS_ERR(rt)) { err = PTR_ERR(rt); if (err == -ENETUNREACH) IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); goto out; } if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) { ip_rt_put(rt); err = -EACCES; goto out; } if (!inet->inet_saddr) inet->inet_saddr = fl4->saddr; /* Update source address */ if (!inet->inet_rcv_saddr) { inet->inet_rcv_saddr = fl4->saddr; if (sk->sk_prot->rehash) sk->sk_prot->rehash(sk); } inet->inet_daddr = fl4->daddr; inet->inet_dport = usin->sin_port; sk->sk_state = TCP_ESTABLISHED; sk_set_txhash(sk); inet->inet_id = jiffies; sk_dst_set(sk, &rt->dst); err = 0; out: return err; }


Hideaki Yoshifuji / 吉藤英明24267.79%15.88%
David S. Miller5515.41%529.41%
Eric Dumazet349.52%423.53%
Wei Dong133.64%15.88%
Tom Herbert51.40%211.76%
Pavel Emelyanov51.40%15.88%
Arnaldo Carvalho de Melo10.28%15.88%
Al Viro10.28%15.88%
Joe Perches10.28%15.88%

int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) { int res; lock_sock(sk); res = __ip4_datagram_connect(sk, uaddr, addr_len); release_sock(sk); return res; }


Eric Dumazet3782.22%133.33%
David S. Miller613.33%133.33%
Hideaki Yoshifuji / 吉藤英明24.44%133.33%

EXPORT_SYMBOL(ip4_datagram_connect); /* Because UDP xmit path can manipulate sk_dst_cache without holding * socket lock, we need to use sk_dst_set() here, * even if we own the socket lock. */
void ip4_datagram_release_cb(struct sock *sk) { const struct inet_sock *inet = inet_sk(sk); const struct ip_options_rcu *inet_opt; __be32 daddr = inet->inet_daddr; struct dst_entry *dst; struct flowi4 fl4; struct rtable *rt; rcu_read_lock(); dst = __sk_dst_get(sk); if (!dst || !dst->obsolete || dst->ops->check(dst, 0)) { rcu_read_unlock(); return; } inet_opt = rcu_dereference(inet->inet_opt); if (inet_opt && inet_opt->opt.srr) daddr = inet_opt->opt.faddr; rt = ip_route_output_ports(sock_net(sk), &fl4, sk, daddr, inet->inet_saddr, inet->inet_dport, inet->inet_sport, sk->sk_protocol, RT_CONN_FLAGS(sk), sk->sk_bound_dev_if); dst = !IS_ERR(rt) ? &rt->dst : NULL; sk_dst_set(sk, dst); rcu_read_unlock(); }


Steffen Klassert13877.09%150.00%
Eric Dumazet4122.91%150.00%


Overall Contributors

Hideaki Yoshifuji / 吉藤英明26943.25%14.76%
Steffen Klassert14322.99%14.76%
Eric Dumazet11818.97%523.81%
David S. Miller619.81%523.81%
Wei Dong132.09%14.76%
Arnaldo Carvalho de Melo60.96%314.29%
Tom Herbert50.80%29.52%
Pavel Emelyanov50.80%14.76%
Joe Perches10.16%14.76%
Al Viro10.16%14.76%
Directory: net/ipv4
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