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| author | David Gibson <david@gibson.dropbear.id.au> | 2022-09-13 16:37:44 +1000 |
|---|---|---|
| committer | Stefano Brivio <sbrivio@redhat.com> | 2022-09-13 11:14:29 +0200 |
| commit | af9c98af5ffc7502c6292a36ffae4913b1ce9acf (patch) | |
| tree | 2ce8171abf75885e06c9e487754514a8ae0be22a | |
| parent | 484652c6322800b32510d6c74d8fc4c8027a106e (diff) | |
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udp: Don't drop zero-length outbound UDP packets
udp_tap_handler() currently skips outbound packets if they have a payload
length of zero. This is not correct, since in a datagram protocol zero
length packets still have meaning.
Adjust this to correctly forward the zero-length packets by using a msghdr
with msg_iovlen == 0.
Bugzilla: https://bugs.passt.top/show_bug.cgi?id=19
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
| -rw-r--r-- | udp.c | 17 |
1 files changed, 10 insertions, 7 deletions
@@ -1075,17 +1075,20 @@ int udp_tap_handler(struct ctx *c, int af, const void *addr, uh_send = packet_get(p, i, 0, sizeof(*uh), &len); if (!uh_send) return p->count; - if (!len) - continue; - - m[i].iov_base = (char *)(uh_send + 1); - m[i].iov_len = len; mm[i].msg_hdr.msg_name = sa; mm[i].msg_hdr.msg_namelen = sl; - mm[i].msg_hdr.msg_iov = m + i; - mm[i].msg_hdr.msg_iovlen = 1; + if (len) { + m[i].iov_base = (char *)(uh_send + 1); + m[i].iov_len = len; + + mm[i].msg_hdr.msg_iov = m + i; + mm[i].msg_hdr.msg_iovlen = 1; + } else { + mm[i].msg_hdr.msg_iov = NULL; + mm[i].msg_hdr.msg_iovlen = 0; + } mm[i].msg_hdr.msg_control = NULL; mm[i].msg_hdr.msg_controllen = 0; |