From: Tom Herbert Date: Sat, 30 Apr 2016 00:12:15 +0000 (-0700) Subject: ipv6: Cleanup IPv6 tunnel receive path X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0d3c703a9d1723c7707e0680019ac8ff5922db42;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git ipv6: Cleanup IPv6 tunnel receive path Some basic changes to make IPv6 tunnel receive path look more like IPv4 path: - Make ip6_tnl_rcv non-static so that GREv6 and others can call it - Make ip6_tnl_rcv look like ip_tunnel_rcv - Switch to gro_cells_receive - Make ip6_tnl_rcv non-static and export it Signed-off-by: Tom Herbert Signed-off-by: David S. Miller --- diff --git a/include/net/ip6_tunnel.h b/include/net/ip6_tunnel.h index 499a707765ea..eab3a9b19ae0 100644 --- a/include/net/ip6_tunnel.h +++ b/include/net/ip6_tunnel.h @@ -42,6 +42,7 @@ struct ip6_tnl { struct __ip6_tnl_parm parms; /* tunnel configuration parameters */ struct flowi fl; /* flowi template for xmit */ struct dst_cache dst_cache; /* cached dst */ + struct gro_cells gro_cells; int err_count; unsigned long err_time; @@ -63,6 +64,9 @@ struct ipv6_tlv_tnl_enc_lim { int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, const struct in6_addr *raddr); +int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, + const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, + bool log_ecn_error); int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, const struct in6_addr *raddr); __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw); diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index 1f20345cbc97..94ed065eff7f 100644 --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -238,6 +238,7 @@ static void ip6_dev_free(struct net_device *dev) { struct ip6_tnl *t = netdev_priv(dev); + gro_cells_destroy(&t->gro_cells); dst_cache_destroy(&t->dst_cache); free_percpu(dev->tstats); free_netdev(dev); @@ -753,97 +754,157 @@ int ip6_tnl_rcv_ctl(struct ip6_tnl *t, } EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); -/** - * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally - * @skb: received socket buffer - * @protocol: ethernet protocol ID - * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN - * - * Return: 0 - **/ - -static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, - __u8 ipproto, - int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, - const struct ipv6hdr *ipv6h, - struct sk_buff *skb)) +static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, + const struct tnl_ptk_info *tpi, + struct metadata_dst *tun_dst, + int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, + const struct ipv6hdr *ipv6h, + struct sk_buff *skb), + bool log_ecn_err) { - struct ip6_tnl *t; + struct pcpu_sw_netstats *tstats; const struct ipv6hdr *ipv6h = ipv6_hdr(skb); - u8 tproto; int err; - rcu_read_lock(); - t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); - if (t) { - struct pcpu_sw_netstats *tstats; + if ((!(tpi->flags & TUNNEL_CSUM) && + (tunnel->parms.i_flags & TUNNEL_CSUM)) || + ((tpi->flags & TUNNEL_CSUM) && + !(tunnel->parms.i_flags & TUNNEL_CSUM))) { + tunnel->dev->stats.rx_crc_errors++; + tunnel->dev->stats.rx_errors++; + goto drop; + } - tproto = ACCESS_ONCE(t->parms.proto); - if (tproto != ipproto && tproto != 0) { - rcu_read_unlock(); - goto discard; + if (tunnel->parms.i_flags & TUNNEL_SEQ) { + if (!(tpi->flags & TUNNEL_SEQ) || + (tunnel->i_seqno && + (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { + tunnel->dev->stats.rx_fifo_errors++; + tunnel->dev->stats.rx_errors++; + goto drop; } + tunnel->i_seqno = ntohl(tpi->seq) + 1; + } - if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { - rcu_read_unlock(); - goto discard; - } + skb->protocol = tpi->proto; - if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { - t->dev->stats.rx_dropped++; - rcu_read_unlock(); - goto discard; + /* Warning: All skb pointers will be invalidated! */ + if (tunnel->dev->type == ARPHRD_ETHER) { + if (!pskb_may_pull(skb, ETH_HLEN)) { + tunnel->dev->stats.rx_length_errors++; + tunnel->dev->stats.rx_errors++; + goto drop; } - skb->mac_header = skb->network_header; - skb_reset_network_header(skb); - skb->protocol = htons(protocol); - memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); - - __skb_tunnel_rx(skb, t->dev, t->net); - - err = dscp_ecn_decapsulate(t, ipv6h, skb); - if (unlikely(err)) { - if (log_ecn_error) - net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", - &ipv6h->saddr, - ipv6_get_dsfield(ipv6h)); - if (err > 1) { - ++t->dev->stats.rx_frame_errors; - ++t->dev->stats.rx_errors; - rcu_read_unlock(); - goto discard; - } + + ipv6h = ipv6_hdr(skb); + skb->protocol = eth_type_trans(skb, tunnel->dev); + skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); + } else { + skb->dev = tunnel->dev; + } + + skb_reset_network_header(skb); + memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); + + __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); + + err = dscp_ecn_decapsulate(tunnel, ipv6h, skb); + if (unlikely(err)) { + if (log_ecn_err) + net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n", + &ipv6h->saddr, + ipv6_get_dsfield(ipv6h)); + if (err > 1) { + ++tunnel->dev->stats.rx_frame_errors; + ++tunnel->dev->stats.rx_errors; + goto drop; } + } - tstats = this_cpu_ptr(t->dev->tstats); - u64_stats_update_begin(&tstats->syncp); - tstats->rx_packets++; - tstats->rx_bytes += skb->len; - u64_stats_update_end(&tstats->syncp); + tstats = this_cpu_ptr(tunnel->dev->tstats); + u64_stats_update_begin(&tstats->syncp); + tstats->rx_packets++; + tstats->rx_bytes += skb->len; + u64_stats_update_end(&tstats->syncp); - netif_rx(skb); + skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); - rcu_read_unlock(); - return 0; + gro_cells_receive(&tunnel->gro_cells, skb); + return 0; + +drop: + kfree_skb(skb); + return 0; +} + +int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb, + const struct tnl_ptk_info *tpi, + struct metadata_dst *tun_dst, + bool log_ecn_err) +{ + return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate, + log_ecn_err); +} +EXPORT_SYMBOL(ip6_tnl_rcv); + +static const struct tnl_ptk_info tpi_v6 = { + /* no tunnel info required for ipxip6. */ + .proto = htons(ETH_P_IPV6), +}; + +static const struct tnl_ptk_info tpi_v4 = { + /* no tunnel info required for ipxip6. */ + .proto = htons(ETH_P_IP), +}; + +static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto, + const struct tnl_ptk_info *tpi, + int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, + const struct ipv6hdr *ipv6h, + struct sk_buff *skb)) +{ + struct ip6_tnl *t; + const struct ipv6hdr *ipv6h = ipv6_hdr(skb); + int ret = -1; + + rcu_read_lock(); + t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); + + if (t) { + u8 tproto = ACCESS_ONCE(t->parms.proto); + + if (tproto != ipproto && tproto != 0) + goto drop; + if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) + goto drop; + if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) + goto drop; + if (iptunnel_pull_header(skb, 0, tpi->proto, false)) + goto drop; + ret = __ip6_tnl_rcv(t, skb, tpi, NULL, dscp_ecn_decapsulate, + log_ecn_error); } + rcu_read_unlock(); - return 1; -discard: + return ret; + +drop: + rcu_read_unlock(); kfree_skb(skb); return 0; } static int ip4ip6_rcv(struct sk_buff *skb) { - return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, - ip4ip6_dscp_ecn_decapsulate); + return ipxip6_rcv(skb, IPPROTO_IP, &tpi_v4, + ip4ip6_dscp_ecn_decapsulate); } static int ip6ip6_rcv(struct sk_buff *skb) { - return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, - ip6ip6_dscp_ecn_decapsulate); + return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6, + ip6ip6_dscp_ecn_decapsulate); } struct ipv6_tel_txoption { @@ -1370,6 +1431,8 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) struct net *net = t->net; struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); + memset(&p1, 0, sizeof(p1)); + switch (cmd) { case SIOCGETTUNNEL: if (dev == ip6n->fb_tnl_dev) { @@ -1549,13 +1612,22 @@ ip6_tnl_dev_init_gen(struct net_device *dev) return -ENOMEM; ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); - if (ret) { - free_percpu(dev->tstats); - dev->tstats = NULL; - return ret; - } + if (ret) + goto free_stats; + + ret = gro_cells_init(&t->gro_cells, dev); + if (ret) + goto destroy_dst; return 0; + +destroy_dst: + dst_cache_destroy(&t->dst_cache); +free_stats: + free_percpu(dev->tstats); + dev->tstats = NULL; + + return ret; } /**