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Date: Sun, 21 Mar 2021 01:20:45 +0100 From: Riccardo Paolo Bestetti <pbl@...tov.io> To: unlisted-recipients:; (no To-header on input) Cc: Riccardo Paolo Bestetti <pbl@...tov.io>, "David S. Miller" <davem@...emloft.net>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, David Ahern <dsahern@...nel.org>, Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH] ipv4/raw: support binding to nonlocal addresses 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 <pbl@...tov.io> --- 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
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