diff options
Diffstat (limited to 'net/ipv6/exthdrs.c')
| -rw-r--r-- | net/ipv6/exthdrs.c | 119 |
1 files changed, 109 insertions, 10 deletions
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c index 5be6da2584ee..922549581abc 100644 --- a/net/ipv6/exthdrs.c +++ b/net/ipv6/exthdrs.c @@ -164,6 +164,7 @@ static int ipv6_destopt_rcv(struct sk_buff **skbp, unsigned int *nhoffp) return -1; } + opt->lastopt = skb->h.raw - skb->nh.raw; opt->dst1 = skb->h.raw - skb->nh.raw; if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) { @@ -243,6 +244,7 @@ static int ipv6_rthdr_rcv(struct sk_buff **skbp, unsigned int *nhoffp) looped_back: if (hdr->segments_left == 0) { + opt->lastopt = skb->h.raw - skb->nh.raw; opt->srcrt = skb->h.raw - skb->nh.raw; skb->h.raw += (hdr->hdrlen + 1) << 3; opt->dst0 = opt->dst1; @@ -404,8 +406,7 @@ ipv6_invert_rthdr(struct sock *sk, struct ipv6_rt_hdr *hdr) memcpy(opt->srcrt, hdr, sizeof(*hdr)); irthdr = (struct rt0_hdr*)opt->srcrt; - /* Obsolete field, MBZ, when originated by us */ - irthdr->bitmap = 0; + irthdr->reserved = 0; opt->srcrt->segments_left = n; for (i=0; i<n; i++) memcpy(irthdr->addr+i, rthdr->addr+(n-1-i), 16); @@ -459,11 +460,10 @@ static int ipv6_hop_jumbo(struct sk_buff *skb, int optoff) IP6_INC_STATS_BH(IPSTATS_MIB_INTRUNCATEDPKTS); goto drop; } - if (pkt_len + sizeof(struct ipv6hdr) < skb->len) { - __pskb_trim(skb, pkt_len + sizeof(struct ipv6hdr)); - if (skb->ip_summed == CHECKSUM_HW) - skb->ip_summed = CHECKSUM_NONE; - } + + if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) + goto drop; + return 1; drop: @@ -539,10 +539,15 @@ void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto, struct in6_addr **daddr) { - if (opt->srcrt) + if (opt->srcrt) { ipv6_push_rthdr(skb, proto, opt->srcrt, daddr); - if (opt->dst0opt) - ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt); + /* + * IPV6_RTHDRDSTOPTS is ignored + * unless IPV6_RTHDR is set (RFC3542). + */ + if (opt->dst0opt) + ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt); + } if (opt->hopopt) ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt); } @@ -573,3 +578,97 @@ ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt) } return opt2; } + +static int ipv6_renew_option(void *ohdr, + struct ipv6_opt_hdr __user *newopt, int newoptlen, + int inherit, + struct ipv6_opt_hdr **hdr, + char **p) +{ + if (inherit) { + if (ohdr) { + memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr)); + *hdr = (struct ipv6_opt_hdr *)*p; + *p += CMSG_ALIGN(ipv6_optlen(*(struct ipv6_opt_hdr **)hdr)); + } + } else { + if (newopt) { + if (copy_from_user(*p, newopt, newoptlen)) + return -EFAULT; + *hdr = (struct ipv6_opt_hdr *)*p; + if (ipv6_optlen(*(struct ipv6_opt_hdr **)hdr) > newoptlen) + return -EINVAL; + *p += CMSG_ALIGN(newoptlen); + } + } + return 0; +} + +struct ipv6_txoptions * +ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, + int newtype, + struct ipv6_opt_hdr __user *newopt, int newoptlen) +{ + int tot_len = 0; + char *p; + struct ipv6_txoptions *opt2; + int err; + + if (newtype != IPV6_HOPOPTS && opt->hopopt) + tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); + if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) + tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); + if (newtype != IPV6_RTHDR && opt->srcrt) + tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); + if (newtype != IPV6_DSTOPTS && opt->dst1opt) + tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); + if (newopt && newoptlen) + tot_len += CMSG_ALIGN(newoptlen); + + if (!tot_len) + return NULL; + + opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); + if (!opt2) + return ERR_PTR(-ENOBUFS); + + memset(opt2, 0, tot_len); + + opt2->tot_len = tot_len; + p = (char *)(opt2 + 1); + + err = ipv6_renew_option(opt->hopopt, newopt, newoptlen, + newtype != IPV6_HOPOPTS, + &opt2->hopopt, &p); + if (err) + goto out; + + err = ipv6_renew_option(opt->dst0opt, newopt, newoptlen, + newtype != IPV6_RTHDRDSTOPTS, + &opt2->dst0opt, &p); + if (err) + goto out; + + err = ipv6_renew_option(opt->srcrt, newopt, newoptlen, + newtype != IPV6_RTHDR, + (struct ipv6_opt_hdr **)opt2->srcrt, &p); + if (err) + goto out; + + err = ipv6_renew_option(opt->dst1opt, newopt, newoptlen, + newtype != IPV6_DSTOPTS, + &opt2->dst1opt, &p); + if (err) + goto out; + + opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + + (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + + (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); + opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); + + return opt2; +out: + sock_kfree_s(sk, p, tot_len); + return ERR_PTR(err); +} + |