[PATCH] ipv4/raw: support binding to nonlocal addresses
From: Riccardo Paolo Bestetti <hidden>
Date: 2021-03-21 00:23:06
Also in:
lkml
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Add support to inet raw sockets for binding to nonlocal addresses through the IP_FREEBIND and IP_TRANSPARENT socket options, as well as the ipv4.ip_nonlocal_bind kernel parameter. Signed-off-by: Riccardo Paolo Bestetti <redacted> --- net/ipv4/raw.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 50a73178d63a..734c0332b54b 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c@@ -717,6 +717,7 @@ static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) { struct inet_sock *inet = inet_sk(sk); struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; + struct net *net = sock_net(sk); u32 tb_id = RT_TABLE_LOCAL; int ret = -EINVAL; int chk_addr_ret;
@@ -732,7 +733,8 @@ static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) tb_id); ret = -EADDRNOTAVAIL; - if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && + if (!inet_can_nonlocal_bind(net, inet) && + addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) goto out; inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
--
2.31.0