From 9145736d4862145684009d6a72a6e61324a9439e Mon Sep 17 00:00:00 2001 From: Lorenzo Colitti Date: Tue, 3 Mar 2015 23:16:16 +0900 Subject: [PATCH] net: ping: Return EAFNOSUPPORT when appropriate. 1. For an IPv4 ping socket, ping_check_bind_addr does not check the family of the socket address that's passed in. Instead, make it behave like inet_bind, which enforces either that the address family is AF_INET, or that the family is AF_UNSPEC and the address is 0.0.0.0. 2. For an IPv6 ping socket, ping_check_bind_addr returns EINVAL if the socket family is not AF_INET6. Return EAFNOSUPPORT instead, for consistency with inet6_bind. 3. Make ping_v4_sendmsg and ping_v6_sendmsg return EAFNOSUPPORT instead of EINVAL if an incorrect socket address structure is passed in. 4. Make IPv6 ping sockets be IPv6-only. The code does not support IPv4, and it cannot easily be made to support IPv4 because the protocol numbers for ICMP and ICMPv6 are different. This makes connect(::ffff:192.0.2.1) fail with EAFNOSUPPORT instead of making the socket unusable. Among other things, this fixes an oops that can be triggered by: int s = socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP); struct sockaddr_in6 sin6 = { .sin6_family = AF_INET6, .sin6_addr = in6addr_any, }; bind(s, (struct sockaddr *) &sin6, sizeof(sin6)); Change-Id: If06ca86d9f1e4593c0d6df174caca3487c57a241 Signed-off-by: Lorenzo Colitti Signed-off-by: David S. Miller --- net/ipv4/ping.c | 12 ++++++++++-- net/ipv6/ping.c | 5 +++-- 2 files changed, 13 insertions(+), 4 deletions(-) diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c index e9f66e1cda50..208d5439e59b 100644 --- a/net/ipv4/ping.c +++ b/net/ipv4/ping.c @@ -259,6 +259,9 @@ int ping_init_sock(struct sock *sk) kgid_t low, high; int ret = 0; + if (sk->sk_family == AF_INET6) + sk->sk_ipv6only = 1; + inet_get_ping_group_range_net(net, &low, &high); if (gid_lte(low, group) && gid_lte(group, high)) return 0; @@ -305,6 +308,11 @@ static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk, if (addr_len < sizeof(*addr)) return -EINVAL; + if (addr->sin_family != AF_INET && + !(addr->sin_family == AF_UNSPEC && + addr->sin_addr.s_addr == htonl(INADDR_ANY))) + return -EAFNOSUPPORT; + pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n", sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port)); @@ -330,7 +338,7 @@ static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk, return -EINVAL; if (addr->sin6_family != AF_INET6) - return -EINVAL; + return -EAFNOSUPPORT; pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n", sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port)); @@ -716,7 +724,7 @@ static int ping_v4_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *m if (msg->msg_namelen < sizeof(*usin)) return -EINVAL; if (usin->sin_family != AF_INET) - return -EINVAL; + return -EAFNOSUPPORT; daddr = usin->sin_addr.s_addr; /* no remote port */ } else { diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c index bd46f736f61d..a2dfff6ff227 100644 --- a/net/ipv6/ping.c +++ b/net/ipv6/ping.c @@ -102,9 +102,10 @@ int ping_v6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, if (msg->msg_name) { DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name); - if (msg->msg_namelen < sizeof(struct sockaddr_in6) || - u->sin6_family != AF_INET6) { + if (msg->msg_namelen < sizeof(*u)) return -EINVAL; + if (u->sin6_family != AF_INET6) { + return -EAFNOSUPPORT; } if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != u->sin6_scope_id) { -- 2.20.1