[PATCH net-next] ipv6: raw: use IPv4 raw_sendmsg on v4-mapped IPv6 destinations
From: Ivan Delalande <hidden>
Date: 2018-01-25 01:49:05
Make IPv6 SOCK_RAW sockets operate like IPv6 UDP and TCP sockets with respect to IPv4 mapped addresses by calling IPv4 raw_sendmsg from rawv6_sendmsg to send those messages out. Signed-off-by: Travis Brown <redacted> Signed-off-by: Ivan Delalande <redacted> --- include/net/raw.h | 1 + net/ipv4/raw.c | 5 +++-- net/ipv6/raw.c | 14 ++++++++++++++ 3 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/include/net/raw.h b/include/net/raw.h
index 99d26d0c4a19..b4dbf730da54 100644
--- a/include/net/raw.h
+++ b/include/net/raw.h@@ -33,6 +33,7 @@ void raw_icmp_error(struct sk_buff *, int, u32); int raw_local_deliver(struct sk_buff *, int); int raw_rcv(struct sock *, struct sk_buff *); +int rawv4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len); #define RAW_HTABLE_SIZE MAX_INET_PROTOS
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 136544b36a46..09f719af8642 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c@@ -499,7 +499,7 @@ static int raw_getfrag(void *from, char *to, int offset, int len, int odd, return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); } -static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) +int rawv4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) { struct inet_sock *inet = inet_sk(sk); struct net *net = sock_net(sk);
@@ -692,6 +692,7 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) err = 0; goto done; } +EXPORT_SYMBOL_GPL(rawv4_sendmsg); static void raw_close(struct sock *sk, long timeout) {
@@ -969,7 +970,7 @@ struct proto raw_prot = { .init = raw_init, .setsockopt = raw_setsockopt, .getsockopt = raw_getsockopt, - .sendmsg = raw_sendmsg, + .sendmsg = rawv4_sendmsg, .recvmsg = raw_recvmsg, .bind = raw_bind, .backlog_rcv = raw_rcv_skb,
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index ddda7eb3c623..f8513e2f1481 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c@@ -844,6 +844,20 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) fl6.flowlabel = np->flow_label; } + if (daddr && ipv6_addr_v4mapped(daddr)) { + struct sockaddr_in sin; + + sin.sin_family = AF_INET; + sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; + sin.sin_addr.s_addr = daddr->s6_addr32[3]; + msg->msg_name = &sin; + msg->msg_namelen = sizeof(sin); + + if (__ipv6_only_sock(sk)) + return -ENETUNREACH; + return rawv4_sendmsg(sk, msg, len); + } + if (fl6.flowi6_oif == 0) fl6.flowi6_oif = sk->sk_bound_dev_if;
--
2.16.1