diff options
| author | andre <andre@FreeBSD.org> | 2005-09-26 20:25:16 +0000 |
|---|---|---|
| committer | andre <andre@FreeBSD.org> | 2005-09-26 20:25:16 +0000 |
| commit | bedcd4ace8e6c1ce8c4308a2e5dd2e0a92d9ac06 (patch) | |
| tree | a3737bbb5bd709abc559f3b94c77fac68eb192c2 /sys/netinet/raw_ip.c | |
| parent | 4eeb530ac72e50536d9d5f48d9cba224a2f48e77 (diff) | |
| download | FreeBSD-src-bedcd4ace8e6c1ce8c4308a2e5dd2e0a92d9ac06.zip FreeBSD-src-bedcd4ace8e6c1ce8c4308a2e5dd2e0a92d9ac06.tar.gz | |
Implement IP_DONTFRAG IP socket option enabling the Don't Fragment
flag on IP packets. Currently this option is only repected on udp
and raw ip sockets. On tcp sockets the DF flag is controlled by the
path MTU discovery option.
Sending a packet larger than the MTU size of the egress interface
returns an EMSGSIZE error.
Discussed with: rwatson
Sponsored by: TCP/IP Optimization Fundraise 2005
Diffstat (limited to 'sys/netinet/raw_ip.c')
| -rw-r--r-- | sys/netinet/raw_ip.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/sys/netinet/raw_ip.c b/sys/netinet/raw_ip.c index 8a128eb..bc250a4 100644 --- a/sys/netinet/raw_ip.c +++ b/sys/netinet/raw_ip.c @@ -271,7 +271,10 @@ rip_output(struct mbuf *m, struct socket *so, u_long dst) INP_LOCK(inp); ip = mtod(m, struct ip *); ip->ip_tos = inp->inp_ip_tos; - ip->ip_off = 0; + if (inp->inp_flags & INP_DONTFRAG) + ip->ip_off = IP_DF; + else + ip->ip_off = 0; ip->ip_p = inp->inp_ip_p; ip->ip_len = m->m_pkthdr.len; if (jailed(inp->inp_socket->so_cred)) |
