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| author | Lennart Poettering <lennart@poettering.net> | 2020-11-16 14:05:52 +0100 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2021-02-18 15:42:18 +0100 |
| commit | 20a001bdd7a8f52fe96ca56100bdd3b9b16ffba9 (patch) | |
| tree | 266bd98c828adf1a2a6b1aad57eed82ed99a1844 /src/resolve/resolved-manager.c | |
| parent | resolved: disable path MTU discovery for UDP traffic (diff) | |
| download | systemd-20a001bdd7a8f52fe96ca56100bdd3b9b16ffba9.tar.xz systemd-20a001bdd7a8f52fe96ca56100bdd3b9b16ffba9.zip | |
resolved: collect incoming fragment size when receiving UDP datagrams
We can later use this to adapt our announced EDNS buffer size in order
to avoid fragmentation to make the best of large datagrams while still
avoiding he security weaknesses of it.
Diffstat (limited to 'src/resolve/resolved-manager.c')
| -rw-r--r-- | src/resolve/resolved-manager.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c index a8b17143b9..fc5f8c79d3 100644 --- a/src/resolve/resolved-manager.c +++ b/src/resolve/resolved-manager.c @@ -19,6 +19,7 @@ #include "idn-util.h" #include "io-util.h" #include "missing_network.h" +#include "missing_socket.h" #include "netlink-util.h" #include "ordered-set.h" #include "parse-util.h" @@ -881,6 +882,9 @@ int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { p->ttl = *(int *) CMSG_DATA(cmsg); break; + case IPV6_RECVFRAGSIZE: + p->fragsize = *(int *) CMSG_DATA(cmsg); + break; } } else if (cmsg->cmsg_level == IPPROTO_IP) { assert(p->family == AF_INET); @@ -900,6 +904,10 @@ int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { case IP_TTL: p->ttl = *(int *) CMSG_DATA(cmsg); break; + + case IP_RECVFRAGSIZE: + p->fragsize = *(int *) CMSG_DATA(cmsg); + break; } } } |