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author | Scott Wood <scottwood@freescale.com> | 2014-04-07 23:49:35 (GMT) |
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committer | Scott Wood <scottwood@freescale.com> | 2014-04-07 23:49:35 (GMT) |
commit | 62b8c978ee6b8d135d9e7953221de58000dba986 (patch) | |
tree | 683b04b2e627f6710c22c151b23c8cc9a165315e /net/netfilter/xt_TCPMSS.c | |
parent | 78fd82238d0e5716578c326404184a27ba67fd6e (diff) | |
download | linux-fsl-qoriq-62b8c978ee6b8d135d9e7953221de58000dba986.tar.xz |
Rewind v3.13-rc3+ (78fd82238d0e5716) to v3.12
Diffstat (limited to 'net/netfilter/xt_TCPMSS.c')
-rw-r--r-- | net/netfilter/xt_TCPMSS.c | 72 |
1 files changed, 34 insertions, 38 deletions
diff --git a/net/netfilter/xt_TCPMSS.c b/net/netfilter/xt_TCPMSS.c index e762de5..cd24290 100644 --- a/net/netfilter/xt_TCPMSS.c +++ b/net/netfilter/xt_TCPMSS.c @@ -43,42 +43,10 @@ optlen(const u_int8_t *opt, unsigned int offset) return opt[offset+1]; } -static u_int32_t tcpmss_reverse_mtu(struct net *net, - const struct sk_buff *skb, - unsigned int family) -{ - struct flowi fl; - const struct nf_afinfo *ai; - struct rtable *rt = NULL; - u_int32_t mtu = ~0U; - - if (family == PF_INET) { - struct flowi4 *fl4 = &fl.u.ip4; - memset(fl4, 0, sizeof(*fl4)); - fl4->daddr = ip_hdr(skb)->saddr; - } else { - struct flowi6 *fl6 = &fl.u.ip6; - - memset(fl6, 0, sizeof(*fl6)); - fl6->daddr = ipv6_hdr(skb)->saddr; - } - rcu_read_lock(); - ai = nf_get_afinfo(family); - if (ai != NULL) - ai->route(net, (struct dst_entry **)&rt, &fl, false); - rcu_read_unlock(); - - if (rt != NULL) { - mtu = dst_mtu(&rt->dst); - dst_release(&rt->dst); - } - return mtu; -} - static int tcpmss_mangle_packet(struct sk_buff *skb, const struct xt_action_param *par, - unsigned int family, + unsigned int in_mtu, unsigned int tcphoff, unsigned int minlen) { @@ -108,9 +76,6 @@ tcpmss_mangle_packet(struct sk_buff *skb, return -1; if (info->mss == XT_TCPMSS_CLAMP_PMTU) { - struct net *net = dev_net(par->in ? par->in : par->out); - unsigned int in_mtu = tcpmss_reverse_mtu(net, skb, family); - if (dst_mtu(skb_dst(skb)) <= minlen) { net_err_ratelimited("unknown or invalid path-MTU (%u)\n", dst_mtu(skb_dst(skb))); @@ -200,6 +165,37 @@ tcpmss_mangle_packet(struct sk_buff *skb, return TCPOLEN_MSS; } +static u_int32_t tcpmss_reverse_mtu(const struct sk_buff *skb, + unsigned int family) +{ + struct flowi fl; + const struct nf_afinfo *ai; + struct rtable *rt = NULL; + u_int32_t mtu = ~0U; + + if (family == PF_INET) { + struct flowi4 *fl4 = &fl.u.ip4; + memset(fl4, 0, sizeof(*fl4)); + fl4->daddr = ip_hdr(skb)->saddr; + } else { + struct flowi6 *fl6 = &fl.u.ip6; + + memset(fl6, 0, sizeof(*fl6)); + fl6->daddr = ipv6_hdr(skb)->saddr; + } + rcu_read_lock(); + ai = nf_get_afinfo(family); + if (ai != NULL) + ai->route(&init_net, (struct dst_entry **)&rt, &fl, false); + rcu_read_unlock(); + + if (rt != NULL) { + mtu = dst_mtu(&rt->dst); + dst_release(&rt->dst); + } + return mtu; +} + static unsigned int tcpmss_tg4(struct sk_buff *skb, const struct xt_action_param *par) { @@ -208,7 +204,7 @@ tcpmss_tg4(struct sk_buff *skb, const struct xt_action_param *par) int ret; ret = tcpmss_mangle_packet(skb, par, - PF_INET, + tcpmss_reverse_mtu(skb, PF_INET), iph->ihl * 4, sizeof(*iph) + sizeof(struct tcphdr)); if (ret < 0) @@ -237,7 +233,7 @@ tcpmss_tg6(struct sk_buff *skb, const struct xt_action_param *par) if (tcphoff < 0) return NF_DROP; ret = tcpmss_mangle_packet(skb, par, - PF_INET6, + tcpmss_reverse_mtu(skb, PF_INET6), tcphoff, sizeof(*ipv6h) + sizeof(struct tcphdr)); if (ret < 0) |