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| author | Denis Vlasenko | 2008-08-24 00:02:18 +0000 |
|---|---|---|
| committer | Denis Vlasenko | 2008-08-24 00:02:18 +0000 |
| commit | 577071558802573119ad5e0695dc6263d81a06fb (patch) | |
| tree | f0d8fea7343fc1d691e9fcd787b1e7d080c7b62d | |
| parent | 15f2fdb2b9ba0d397babe0922ae28f84e91505f9 (diff) | |
| download | busybox-577071558802573119ad5e0695dc6263d81a06fb.zip busybox-577071558802573119ad5e0695dc6263d81a06fb.tar.gz | |
ping: SO_RCVBUF must be bigger than packet size,
otherwise large ping packets might fail to be received.
| -rw-r--r-- | networking/ping.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/networking/ping.c b/networking/ping.c index 5def8c3..7cccfbf 100644 --- a/networking/ping.c +++ b/networking/ping.c @@ -576,8 +576,9 @@ static void ping4(len_and_sockaddr *lsa) /* enable broadcast pings */ setsockopt_broadcast(pingsock); - /* set recv buf for broadcast pings */ - sockopt = 48 * 1024; /* explain why 48k? */ + /* set recv buf (needed if we can get lots of responses: flood ping, + * broadcast ping etc) */ + sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */ setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt)); signal(SIGINT, print_stats_and_exit); @@ -640,8 +641,9 @@ static void ping6(len_and_sockaddr *lsa) /* enable broadcast pings */ setsockopt_broadcast(pingsock); - /* set recv buf for broadcast pings */ - sockopt = 48 * 1024; /* explain why 48k? */ + /* set recv buf (needed if we can get lots of responses: flood ping, + * broadcast ping etc) */ + sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */ setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt)); sockopt = offsetof(struct icmp6_hdr, icmp6_cksum); |