diff options
Diffstat (limited to 'net/xfrm/xfrm_replay.c')
| -rw-r--r-- | net/xfrm/xfrm_replay.c | 162 |
1 files changed, 159 insertions, 3 deletions
diff --git a/net/xfrm/xfrm_replay.c b/net/xfrm/xfrm_replay.c index cdc2e2e..8b23c5b 100644 --- a/net/xfrm/xfrm_replay.c +++ b/net/xfrm/xfrm_replay.c @@ -45,7 +45,8 @@ u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq) return seq_hi; } - +EXPORT_SYMBOL(xfrm_replay_seqhi); +; static void xfrm_replay_notify(struct xfrm_state *x, int event) { struct km_event c; @@ -558,6 +559,158 @@ static void xfrm_replay_advance_esn(struct xfrm_state *x, __be32 net_seq) x->repl->notify(x, XFRM_REPLAY_UPDATE); } +#ifdef CONFIG_XFRM_OFFLOAD +static int xfrm_replay_overflow_offload(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = 0; + struct net *net = xs_net(x); + struct xfrm_offload *xo = xfrm_offload(skb); + __u32 oseq = x->replay.oseq; + + if (!xo) + return xfrm_replay_overflow(x, skb); + + if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { + if (!skb_is_gso(skb)) { + XFRM_SKB_CB(skb)->seq.output.low = ++oseq; + xo->seq.low = oseq; + } else { + XFRM_SKB_CB(skb)->seq.output.low = oseq + 1; + xo->seq.low = oseq + 1; + oseq += skb_shinfo(skb)->gso_segs; + } + + XFRM_SKB_CB(skb)->seq.output.hi = 0; + xo->seq.hi = 0; + if (unlikely(oseq < x->replay.oseq)) { + xfrm_audit_state_replay_overflow(x, skb); + err = -EOVERFLOW; + + return err; + } + + x->replay.oseq = oseq; + + if (xfrm_aevent_is_on(net)) + x->repl->notify(x, XFRM_REPLAY_UPDATE); + } + + return err; +} + +static int xfrm_replay_overflow_offload_bmp(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = 0; + struct xfrm_offload *xo = xfrm_offload(skb); + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + struct net *net = xs_net(x); + __u32 oseq = replay_esn->oseq; + + if (!xo) + return xfrm_replay_overflow_bmp(x, skb); + + if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { + if (!skb_is_gso(skb)) { + XFRM_SKB_CB(skb)->seq.output.low = ++oseq; + xo->seq.low = oseq; + } else { + XFRM_SKB_CB(skb)->seq.output.low = oseq + 1; + xo->seq.low = oseq + 1; + oseq += skb_shinfo(skb)->gso_segs; + } + + XFRM_SKB_CB(skb)->seq.output.hi = 0; + xo->seq.hi = 0; + if (unlikely(oseq < replay_esn->oseq)) { + xfrm_audit_state_replay_overflow(x, skb); + err = -EOVERFLOW; + + return err; + } else { + replay_esn->oseq = oseq; + } + + if (xfrm_aevent_is_on(net)) + x->repl->notify(x, XFRM_REPLAY_UPDATE); + } + + return err; +} + +static int xfrm_replay_overflow_offload_esn(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = 0; + struct xfrm_offload *xo = xfrm_offload(skb); + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + struct net *net = xs_net(x); + __u32 oseq = replay_esn->oseq; + __u32 oseq_hi = replay_esn->oseq_hi; + + if (!xo) + return xfrm_replay_overflow_esn(x, skb); + + if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { + if (!skb_is_gso(skb)) { + XFRM_SKB_CB(skb)->seq.output.low = ++oseq; + XFRM_SKB_CB(skb)->seq.output.hi = oseq_hi; + xo->seq.low = oseq; + xo->seq.hi = oseq_hi; + } else { + XFRM_SKB_CB(skb)->seq.output.low = oseq + 1; + XFRM_SKB_CB(skb)->seq.output.hi = oseq_hi; + xo->seq.low = oseq = oseq + 1; + xo->seq.hi = oseq_hi; + oseq += skb_shinfo(skb)->gso_segs; + } + + if (unlikely(oseq < replay_esn->oseq)) { + XFRM_SKB_CB(skb)->seq.output.hi = ++oseq_hi; + xo->seq.hi = oseq_hi; + + if (replay_esn->oseq_hi == 0) { + replay_esn->oseq--; + replay_esn->oseq_hi--; + xfrm_audit_state_replay_overflow(x, skb); + err = -EOVERFLOW; + + return err; + } + } + + replay_esn->oseq = oseq; + replay_esn->oseq_hi = oseq_hi; + + if (xfrm_aevent_is_on(net)) + x->repl->notify(x, XFRM_REPLAY_UPDATE); + } + + return err; +} + +static const struct xfrm_replay xfrm_replay_legacy = { + .advance = xfrm_replay_advance, + .check = xfrm_replay_check, + .recheck = xfrm_replay_check, + .notify = xfrm_replay_notify, + .overflow = xfrm_replay_overflow_offload, +}; + +static const struct xfrm_replay xfrm_replay_bmp = { + .advance = xfrm_replay_advance_bmp, + .check = xfrm_replay_check_bmp, + .recheck = xfrm_replay_check_bmp, + .notify = xfrm_replay_notify_bmp, + .overflow = xfrm_replay_overflow_offload_bmp, +}; + +static const struct xfrm_replay xfrm_replay_esn = { + .advance = xfrm_replay_advance_esn, + .check = xfrm_replay_check_esn, + .recheck = xfrm_replay_recheck_esn, + .notify = xfrm_replay_notify_esn, + .overflow = xfrm_replay_overflow_offload_esn, +}; +#else static const struct xfrm_replay xfrm_replay_legacy = { .advance = xfrm_replay_advance, .check = xfrm_replay_check, @@ -581,6 +734,7 @@ static const struct xfrm_replay xfrm_replay_esn = { .notify = xfrm_replay_notify_esn, .overflow = xfrm_replay_overflow_esn, }; +#endif int xfrm_init_replay(struct xfrm_state *x) { @@ -595,10 +749,12 @@ int xfrm_init_replay(struct xfrm_state *x) if (replay_esn->replay_window == 0) return -EINVAL; x->repl = &xfrm_replay_esn; - } else + } else { x->repl = &xfrm_replay_bmp; - } else + } + } else { x->repl = &xfrm_replay_legacy; + } return 0; } |
