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| author | Feng Wu <wufengwufengwufeng@gmail.com> | 2026-06-25 04:44:26 -0400 |
|---|---|---|
| committer | Florian Westphal <fw@strlen.de> | 2026-07-02 12:17:14 +0200 |
| commit | 68fc6c6470d653fcfa7655f4f2b36ff444cb72b3 (patch) | |
| tree | ee8bcbb03c14bc282cd9499a878ed786277fa691 | |
| parent | 5efbced92ec19514528ce6b18ae8e1b755cc4552 (diff) | |
| download | linux-68fc6c6470d653fcfa7655f4f2b36ff444cb72b3.tar.gz linux-68fc6c6470d653fcfa7655f4f2b36ff444cb72b3.zip | |
netfilter: xt_tcpmss: add checkentry for parameter validation
Add tcpmss_mt_check() that validates mss_min <= mss_max and
invert <= 1.
Signed-off-by: Feng Wu <wufengwufengwufeng@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
| -rw-r--r-- | net/netfilter/xt_tcpmss.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/net/netfilter/xt_tcpmss.c b/net/netfilter/xt_tcpmss.c index b9da8269161d..b08b077d7f0a 100644 --- a/net/netfilter/xt_tcpmss.c +++ b/net/netfilter/xt_tcpmss.c @@ -78,10 +78,23 @@ dropit: return false; } +static int tcpmss_mt_check(const struct xt_mtchk_param *par) +{ + const struct xt_tcpmss_match_info *info = par->matchinfo; + + if (info->mss_min > info->mss_max) + return -EINVAL; + if (info->invert > 1) + return -EINVAL; + + return 0; +} + static struct xt_match tcpmss_mt_reg[] __read_mostly = { { .name = "tcpmss", .family = NFPROTO_IPV4, + .checkentry = tcpmss_mt_check, .match = tcpmss_mt, .matchsize = sizeof(struct xt_tcpmss_match_info), .proto = IPPROTO_TCP, |