diff options
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/ip_fragment.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c index e6215bd..a1151b8 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -45,6 +45,7 @@ #include <linux/udp.h> #include <linux/inet.h> #include <linux/netfilter_ipv4.h> +#include <net/inet_ecn.h> /* NOTE. Logic of IP defragmentation is parallel to corresponding IPv6 * code now. If you change something here, _PLEASE_ update ipv6/reassembly.c @@ -70,11 +71,28 @@ struct ipq { __be32 daddr; __be16 id; u8 protocol; + u8 ecn; /* RFC3168 support */ int iif; unsigned int rid; struct inet_peer *peer; }; +#define IPFRAG_ECN_CLEAR 0x01 /* one frag had INET_ECN_NOT_ECT */ +#define IPFRAG_ECN_SET_CE 0x04 /* one frag had INET_ECN_CE */ + +static inline u8 ip4_frag_ecn(u8 tos) +{ + tos = (tos & INET_ECN_MASK) + 1; + /* + * After the last operation we have (in binary): + * INET_ECN_NOT_ECT => 001 + * INET_ECN_ECT_1 => 010 + * INET_ECN_ECT_0 => 011 + * INET_ECN_CE => 100 + */ + return (tos & 2) ? 0 : tos; +} + static struct inet_frags ip4_frags; int ip_frag_nqueues(struct net *net) @@ -137,6 +155,7 @@ static void ip4_frag_init(struct inet_frag_queue *q, void *a) qp->protocol = arg->iph->protocol; qp->id = arg->iph->id; + qp->ecn = ip4_frag_ecn(arg->iph->tos); qp->saddr = arg->iph->saddr; qp->daddr = arg->iph->daddr; qp->user = arg->user; @@ -316,6 +335,7 @@ static int ip_frag_reinit(struct ipq *qp) qp->q.fragments = NULL; qp->q.fragments_tail = NULL; qp->iif = 0; + qp->ecn = 0; return 0; } @@ -328,6 +348,7 @@ static int ip_frag_queue(struct ipq *qp, struct sk_buff *skb) int flags, offset; int ihl, end; int err = -ENOENT; + u8 ecn; if (qp->q.last_in & INET_FRAG_COMPLETE) goto err; @@ -339,6 +360,7 @@ static int ip_frag_queue(struct ipq *qp, struct sk_buff *skb) goto err; } + ecn = ip4_frag_ecn(ip_hdr(skb)->tos); offset = ntohs(ip_hdr(skb)->frag_off); flags = offset & ~IP_OFFSET; offset &= IP_OFFSET; @@ -472,6 +494,7 @@ found: } qp->q.stamp = skb->tstamp; qp->q.meat += skb->len; + qp->ecn |= ecn; atomic_add(skb->truesize, &qp->q.net->mem); if (offset == 0) qp->q.last_in |= INET_FRAG_FIRST_IN; @@ -583,6 +606,17 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev, iph = ip_hdr(head); iph->frag_off = 0; iph->tot_len = htons(len); + /* RFC3168 5.3 Fragmentation support + * If one fragment had INET_ECN_NOT_ECT, + * reassembled frame also has INET_ECN_NOT_ECT + * Elif one fragment had INET_ECN_CE + * reassembled frame also has INET_ECN_CE + */ + if (qp->ecn & IPFRAG_ECN_CLEAR) + iph->tos &= ~INET_ECN_MASK; + else if (qp->ecn & IPFRAG_ECN_SET_CE) + iph->tos |= INET_ECN_CE; + IP_INC_STATS_BH(net, IPSTATS_MIB_REASMOKS); qp->q.fragments = NULL; qp->q.fragments_tail = NULL; |
