External/passt
1
0
Fork 0
mirror of https://passt.top/passt synced 2025-02-22 10:52:21 +00:00
Code Issues Packages Projects Releases Wiki Activity

tcp: Don't round down MSS to >= 64KiB page size, but clamp it in any case

Browse Source 
On some architectures, the page size is bigger than the maximum size
of an Ethernet frame.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2022-01-26 06:45:31 +01:00
parent 34872fadec
commit be265eef06
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
tcp.c
View File

@ -1671,7 +1671,7 @@ static int tcp_send_to_tap(struct ctx *c, struct tcp_tap_conn *conn, int flags,
}
if (flags & SYN) {
uint16_t mss;
int mss;
/* Options: MSS, NOP and window scale (8 bytes) */
optlen = OPT_MSS_LEN + 1 + OPT_WS_LEN;
@ -1691,10 +1691,10 @@ static int tcp_send_to_tap(struct ctx *c, struct tcp_tap_conn *conn, int flags,
if (c->low_wmem &&
!conn->local && !tcp_rtt_dst_low(conn))
mss = MIN(mss, PAGE_SIZE);
else
else if (mss > PAGE_SIZE)
mss = ROUND_DOWN(mss, PAGE_SIZE);
}
*(uint16_t *)data = htons(mss);
*(uint16_t *)data = htons(MIN(USHRT_MAX, mss));
data += OPT_MSS_LEN - 2;
th->doff += OPT_MSS_LEN / 4;