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tcp: Don't round down MSS to >= 64KiB page size, but clamp it in any case
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:
parent
34872fadec
commit
be265eef06
6
tcp.c
6
tcp.c
@ -1671,7 +1671,7 @@ static int tcp_send_to_tap(struct ctx *c, struct tcp_tap_conn *conn, int flags,
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}
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}
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if (flags & SYN) {
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if (flags & SYN) {
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uint16_t mss;
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int mss;
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/* Options: MSS, NOP and window scale (8 bytes) */
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/* Options: MSS, NOP and window scale (8 bytes) */
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optlen = OPT_MSS_LEN + 1 + OPT_WS_LEN;
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optlen = OPT_MSS_LEN + 1 + OPT_WS_LEN;
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@ -1691,10 +1691,10 @@ static int tcp_send_to_tap(struct ctx *c, struct tcp_tap_conn *conn, int flags,
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if (c->low_wmem &&
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if (c->low_wmem &&
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!conn->local && !tcp_rtt_dst_low(conn))
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!conn->local && !tcp_rtt_dst_low(conn))
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mss = MIN(mss, PAGE_SIZE);
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mss = MIN(mss, PAGE_SIZE);
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else
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else if (mss > PAGE_SIZE)
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mss = ROUND_DOWN(mss, PAGE_SIZE);
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mss = ROUND_DOWN(mss, PAGE_SIZE);
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}
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}
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*(uint16_t *)data = htons(mss);
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*(uint16_t *)data = htons(MIN(USHRT_MAX, mss));
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data += OPT_MSS_LEN - 2;
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data += OPT_MSS_LEN - 2;
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th->doff += OPT_MSS_LEN / 4;
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th->doff += OPT_MSS_LEN / 4;
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