diff options
| author |   Al Viro <viro@zeniv.linux.org.uk> | 2020-04-27 10:49:26 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-05-20 20:31:31 -0400 |
| commit | 2bbf8c1ead651c65bd0f7b6ba6d57cb09e2d1a57 (patch) | |
| tree | 2b0ee931cf3b3268a975cad50d19826c91f6bb81 /net/ipv4/ip_sockglue.c | |
| parent | ipv[46]: do compat setsockopt for MCAST_{JOIN,LEAVE}_GROUP directly (diff) | |
| download | wireguard-linux-2bbf8c1ead651c65bd0f7b6ba6d57cb09e2d1a57.tar.xz wireguard-linux-2bbf8c1ead651c65bd0f7b6ba6d57cb09e2d1a57.zip | |
ipv4: take handling of group_source_req options into a helper
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'net/ipv4/ip_sockglue.c')
| -rw-r--r-- | net/ipv4/ip_sockglue.c | 83 |
1 files changed, 44 insertions, 39 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index 34c3a43a9c98..7f065a68664e 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -624,6 +624,49 @@ Eaddrnotavail: return -EADDRNOTAVAIL; } +static int do_mcast_group_source(struct sock *sk, int optname, + struct group_source_req *greqs) +{ + struct ip_mreq_source mreqs; + struct sockaddr_in *psin; + int omode, add, err; + + if (greqs->gsr_group.ss_family != AF_INET || + greqs->gsr_source.ss_family != AF_INET) + return -EADDRNOTAVAIL; + + psin = (struct sockaddr_in *)&greqs->gsr_group; + mreqs.imr_multiaddr = psin->sin_addr.s_addr; + psin = (struct sockaddr_in *)&greqs->gsr_source; + mreqs.imr_sourceaddr = psin->sin_addr.s_addr; + mreqs.imr_interface = 0; /* use index for mc_source */ + + if (optname == MCAST_BLOCK_SOURCE) { + omode = MCAST_EXCLUDE; + add = 1; + } else if (optname == MCAST_UNBLOCK_SOURCE) { + omode = MCAST_EXCLUDE; + add = 0; + } else if (optname == MCAST_JOIN_SOURCE_GROUP) { + struct ip_mreqn mreq; + + psin = (struct sockaddr_in *)&greqs->gsr_group; + mreq.imr_multiaddr = psin->sin_addr; + mreq.imr_address.s_addr = 0; + mreq.imr_ifindex = greqs->gsr_interface; + err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); + if (err && err != -EADDRINUSE) + return err; + greqs->gsr_interface = mreq.imr_ifindex; + omode = MCAST_INCLUDE; + add = 1; + } else /* MCAST_LEAVE_SOURCE_GROUP */ { + omode = MCAST_INCLUDE; + add = 0; + } + return ip_mc_source(add, omode, sk, &mreqs, greqs->gsr_interface); +} + static int do_ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen) { @@ -1066,9 +1109,6 @@ static int do_ip_setsockopt(struct sock *sk, int level, case MCAST_UNBLOCK_SOURCE: { struct group_source_req greqs; - struct ip_mreq_source mreqs; - struct sockaddr_in *psin; - int omode, add; if (optlen != sizeof(struct group_source_req)) goto e_inval; @@ -1076,42 +1116,7 @@ static int do_ip_setsockopt(struct sock *sk, int level, err = -EFAULT; break; } - if (greqs.gsr_group.ss_family != AF_INET || - greqs.gsr_source.ss_family != AF_INET) { - err = -EADDRNOTAVAIL; - break; - } - psin = (struct sockaddr_in *)&greqs.gsr_group; - mreqs.imr_multiaddr = psin->sin_addr.s_addr; - psin = (struct sockaddr_in *)&greqs.gsr_source; - mreqs.imr_sourceaddr = psin->sin_addr.s_addr; - mreqs.imr_interface = 0; /* use index for mc_source */ - - if (optname == MCAST_BLOCK_SOURCE) { - omode = MCAST_EXCLUDE; - add = 1; - } else if (optname == MCAST_UNBLOCK_SOURCE) { - omode = MCAST_EXCLUDE; - add = 0; - } else if (optname == MCAST_JOIN_SOURCE_GROUP) { - struct ip_mreqn mreq; - - psin = (struct sockaddr_in *)&greqs.gsr_group; - mreq.imr_multiaddr = psin->sin_addr; - mreq.imr_address.s_addr = 0; - mreq.imr_ifindex = greqs.gsr_interface; - err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); - if (err && err != -EADDRINUSE) - break; - greqs.gsr_interface = mreq.imr_ifindex; - omode = MCAST_INCLUDE; - add = 1; - } else /* MCAST_LEAVE_SOURCE_GROUP */ { - omode = MCAST_INCLUDE; - add = 0; - } - err = ip_mc_source(add, omode, sk, &mreqs, - greqs.gsr_interface); + err = do_mcast_group_source(sk, optname, &greqs); break; } case MCAST_MSFILTER: |