Merge branch 'skb_checksum_help'
Paul Durrant says: ==================== make skb_checksum_setup generally available Both xen-netfront and xen-netback need to be able to set up the partial checksum offset of an skb and may also need to recalculate the pseudo- header checksum in the process. This functionality is currently private and duplicated between the two drivers. Patch #1 of this series moves the implementation into the core network code as there is nothing xen-specific about it and it is potentially useful to any network driver. Patch #2 removes the private implementation from netback. Patch #3 removes the private implementation from netfront. v2: - Put skb_checksum_setup in skbuff.c rather than dev.c - remove inline ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
commit
a49da8811e
@ -39,7 +39,6 @@
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#include <linux/udp.h>
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#include <net/tcp.h>
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#include <net/ip6_checksum.h>
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#include <xen/xen.h>
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#include <xen/events.h>
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@ -1051,257 +1050,9 @@ static int xenvif_set_skb_gso(struct xenvif *vif,
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return 0;
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}
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static inline int maybe_pull_tail(struct sk_buff *skb, unsigned int len,
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unsigned int max)
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{
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if (skb_headlen(skb) >= len)
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return 0;
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/* If we need to pullup then pullup to the max, so we
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* won't need to do it again.
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*/
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if (max > skb->len)
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max = skb->len;
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if (__pskb_pull_tail(skb, max - skb_headlen(skb)) == NULL)
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return -ENOMEM;
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if (skb_headlen(skb) < len)
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return -EPROTO;
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return 0;
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}
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/* This value should be large enough to cover a tagged ethernet header plus
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* maximally sized IP and TCP or UDP headers.
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*/
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#define MAX_IP_HDR_LEN 128
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static int checksum_setup_ip(struct xenvif *vif, struct sk_buff *skb,
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int recalculate_partial_csum)
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{
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unsigned int off;
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bool fragment;
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int err;
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fragment = false;
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err = maybe_pull_tail(skb,
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sizeof(struct iphdr),
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MAX_IP_HDR_LEN);
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if (err < 0)
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goto out;
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if (ip_hdr(skb)->frag_off & htons(IP_OFFSET | IP_MF))
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fragment = true;
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off = ip_hdrlen(skb);
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err = -EPROTO;
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if (fragment)
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goto out;
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switch (ip_hdr(skb)->protocol) {
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case IPPROTO_TCP:
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err = maybe_pull_tail(skb,
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off + sizeof(struct tcphdr),
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MAX_IP_HDR_LEN);
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if (err < 0)
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goto out;
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if (!skb_partial_csum_set(skb, off,
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offsetof(struct tcphdr, check))) {
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err = -EPROTO;
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goto out;
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}
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if (recalculate_partial_csum)
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tcp_hdr(skb)->check =
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~csum_tcpudp_magic(ip_hdr(skb)->saddr,
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ip_hdr(skb)->daddr,
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skb->len - off,
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IPPROTO_TCP, 0);
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break;
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case IPPROTO_UDP:
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err = maybe_pull_tail(skb,
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off + sizeof(struct udphdr),
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MAX_IP_HDR_LEN);
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if (err < 0)
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goto out;
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if (!skb_partial_csum_set(skb, off,
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offsetof(struct udphdr, check))) {
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err = -EPROTO;
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goto out;
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}
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if (recalculate_partial_csum)
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udp_hdr(skb)->check =
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~csum_tcpudp_magic(ip_hdr(skb)->saddr,
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ip_hdr(skb)->daddr,
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skb->len - off,
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IPPROTO_UDP, 0);
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break;
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default:
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goto out;
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}
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err = 0;
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out:
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return err;
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}
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/* This value should be large enough to cover a tagged ethernet header plus
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* an IPv6 header, all options, and a maximal TCP or UDP header.
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*/
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#define MAX_IPV6_HDR_LEN 256
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#define OPT_HDR(type, skb, off) \
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(type *)(skb_network_header(skb) + (off))
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static int checksum_setup_ipv6(struct xenvif *vif, struct sk_buff *skb,
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int recalculate_partial_csum)
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{
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int err;
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u8 nexthdr;
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unsigned int off;
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unsigned int len;
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bool fragment;
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bool done;
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fragment = false;
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done = false;
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off = sizeof(struct ipv6hdr);
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err = maybe_pull_tail(skb, off, MAX_IPV6_HDR_LEN);
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if (err < 0)
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goto out;
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nexthdr = ipv6_hdr(skb)->nexthdr;
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len = sizeof(struct ipv6hdr) + ntohs(ipv6_hdr(skb)->payload_len);
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while (off <= len && !done) {
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switch (nexthdr) {
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case IPPROTO_DSTOPTS:
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case IPPROTO_HOPOPTS:
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case IPPROTO_ROUTING: {
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struct ipv6_opt_hdr *hp;
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err = maybe_pull_tail(skb,
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off +
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sizeof(struct ipv6_opt_hdr),
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MAX_IPV6_HDR_LEN);
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if (err < 0)
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goto out;
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hp = OPT_HDR(struct ipv6_opt_hdr, skb, off);
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nexthdr = hp->nexthdr;
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off += ipv6_optlen(hp);
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break;
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}
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case IPPROTO_AH: {
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struct ip_auth_hdr *hp;
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err = maybe_pull_tail(skb,
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off +
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sizeof(struct ip_auth_hdr),
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MAX_IPV6_HDR_LEN);
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if (err < 0)
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goto out;
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hp = OPT_HDR(struct ip_auth_hdr, skb, off);
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nexthdr = hp->nexthdr;
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off += ipv6_authlen(hp);
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break;
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}
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case IPPROTO_FRAGMENT: {
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struct frag_hdr *hp;
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err = maybe_pull_tail(skb,
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off +
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sizeof(struct frag_hdr),
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MAX_IPV6_HDR_LEN);
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if (err < 0)
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goto out;
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hp = OPT_HDR(struct frag_hdr, skb, off);
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if (hp->frag_off & htons(IP6_OFFSET | IP6_MF))
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fragment = true;
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nexthdr = hp->nexthdr;
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off += sizeof(struct frag_hdr);
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break;
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}
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default:
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done = true;
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break;
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}
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}
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err = -EPROTO;
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if (!done || fragment)
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goto out;
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switch (nexthdr) {
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case IPPROTO_TCP:
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err = maybe_pull_tail(skb,
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off + sizeof(struct tcphdr),
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MAX_IPV6_HDR_LEN);
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if (err < 0)
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goto out;
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if (!skb_partial_csum_set(skb, off,
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offsetof(struct tcphdr, check))) {
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err = -EPROTO;
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goto out;
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}
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if (recalculate_partial_csum)
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tcp_hdr(skb)->check =
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~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
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&ipv6_hdr(skb)->daddr,
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skb->len - off,
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IPPROTO_TCP, 0);
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break;
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case IPPROTO_UDP:
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err = maybe_pull_tail(skb,
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off + sizeof(struct udphdr),
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MAX_IPV6_HDR_LEN);
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if (err < 0)
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goto out;
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if (!skb_partial_csum_set(skb, off,
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offsetof(struct udphdr, check))) {
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err = -EPROTO;
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goto out;
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}
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if (recalculate_partial_csum)
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udp_hdr(skb)->check =
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~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
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&ipv6_hdr(skb)->daddr,
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skb->len - off,
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IPPROTO_UDP, 0);
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break;
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default:
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goto out;
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}
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err = 0;
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out:
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return err;
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}
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static int checksum_setup(struct xenvif *vif, struct sk_buff *skb)
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{
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int err = -EPROTO;
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int recalculate_partial_csum = 0;
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bool recalculate_partial_csum = false;
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/* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
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* peers can fail to set NETRXF_csum_blank when sending a GSO
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@ -1311,19 +1062,14 @@ static int checksum_setup(struct xenvif *vif, struct sk_buff *skb)
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if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) {
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vif->rx_gso_checksum_fixup++;
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skb->ip_summed = CHECKSUM_PARTIAL;
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recalculate_partial_csum = 1;
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recalculate_partial_csum = true;
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}
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/* A non-CHECKSUM_PARTIAL SKB does not require setup. */
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if (skb->ip_summed != CHECKSUM_PARTIAL)
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return 0;
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if (skb->protocol == htons(ETH_P_IP))
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err = checksum_setup_ip(vif, skb, recalculate_partial_csum);
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else if (skb->protocol == htons(ETH_P_IPV6))
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err = checksum_setup_ipv6(vif, skb, recalculate_partial_csum);
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return err;
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return skb_checksum_setup(skb, recalculate_partial_csum);
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}
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static bool tx_credit_exceeded(struct xenvif *vif, unsigned size)
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@ -859,9 +859,7 @@ static RING_IDX xennet_fill_frags(struct netfront_info *np,
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static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
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{
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struct iphdr *iph;
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int err = -EPROTO;
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int recalculate_partial_csum = 0;
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bool recalculate_partial_csum = false;
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/*
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* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
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@ -873,54 +871,14 @@ static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
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struct netfront_info *np = netdev_priv(dev);
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np->rx_gso_checksum_fixup++;
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skb->ip_summed = CHECKSUM_PARTIAL;
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recalculate_partial_csum = 1;
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recalculate_partial_csum = true;
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}
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/* A non-CHECKSUM_PARTIAL SKB does not require setup. */
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if (skb->ip_summed != CHECKSUM_PARTIAL)
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return 0;
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if (skb->protocol != htons(ETH_P_IP))
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goto out;
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iph = (void *)skb->data;
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switch (iph->protocol) {
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case IPPROTO_TCP:
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if (!skb_partial_csum_set(skb, 4 * iph->ihl,
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offsetof(struct tcphdr, check)))
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goto out;
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if (recalculate_partial_csum) {
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struct tcphdr *tcph = tcp_hdr(skb);
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tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
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skb->len - iph->ihl*4,
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IPPROTO_TCP, 0);
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}
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break;
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case IPPROTO_UDP:
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if (!skb_partial_csum_set(skb, 4 * iph->ihl,
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offsetof(struct udphdr, check)))
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goto out;
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if (recalculate_partial_csum) {
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struct udphdr *udph = udp_hdr(skb);
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udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
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skb->len - iph->ihl*4,
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IPPROTO_UDP, 0);
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}
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break;
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default:
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if (net_ratelimit())
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pr_err("Attempting to checksum a non-TCP/UDP packet, dropping a protocol %d packet\n",
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iph->protocol);
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||||
goto out;
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||||
}
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||||
|
||||
err = 0;
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||||
|
||||
out:
|
||||
return err;
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||||
return skb_checksum_setup(skb, recalculate_partial_csum);
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||||
}
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||||
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||||
static int handle_incoming_queue(struct net_device *dev,
|
||||
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||||
@ -2893,6 +2893,8 @@ static inline void skb_checksum_none_assert(const struct sk_buff *skb)
|
||||
|
||||
bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off);
|
||||
|
||||
int skb_checksum_setup(struct sk_buff *skb, bool recalculate);
|
||||
|
||||
u32 __skb_get_poff(const struct sk_buff *skb);
|
||||
|
||||
/**
|
||||
|
||||
@ -65,6 +65,7 @@
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||||
#include <net/dst.h>
|
||||
#include <net/sock.h>
|
||||
#include <net/checksum.h>
|
||||
#include <net/ip6_checksum.h>
|
||||
#include <net/xfrm.h>
|
||||
|
||||
#include <asm/uaccess.h>
|
||||
@ -3549,6 +3550,278 @@ bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off)
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(skb_partial_csum_set);
|
||||
|
||||
static int skb_maybe_pull_tail(struct sk_buff *skb, unsigned int len,
|
||||
unsigned int max)
|
||||
{
|
||||
if (skb_headlen(skb) >= len)
|
||||
return 0;
|
||||
|
||||
/* If we need to pullup then pullup to the max, so we
|
||||
* won't need to do it again.
|
||||
*/
|
||||
if (max > skb->len)
|
||||
max = skb->len;
|
||||
|
||||
if (__pskb_pull_tail(skb, max - skb_headlen(skb)) == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
if (skb_headlen(skb) < len)
|
||||
return -EPROTO;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* This value should be large enough to cover a tagged ethernet header plus
|
||||
* maximally sized IP and TCP or UDP headers.
|
||||
*/
|
||||
#define MAX_IP_HDR_LEN 128
|
||||
|
||||
static int skb_checksum_setup_ip(struct sk_buff *skb, bool recalculate)
|
||||
{
|
||||
unsigned int off;
|
||||
bool fragment;
|
||||
int err;
|
||||
|
||||
fragment = false;
|
||||
|
||||
err = skb_maybe_pull_tail(skb,
|
||||
sizeof(struct iphdr),
|
||||
MAX_IP_HDR_LEN);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
|
||||
if (ip_hdr(skb)->frag_off & htons(IP_OFFSET | IP_MF))
|
||||
fragment = true;
|
||||
|
||||
off = ip_hdrlen(skb);
|
||||
|
||||
err = -EPROTO;
|
||||
|
||||
if (fragment)
|
||||
goto out;
|
||||
|
||||
switch (ip_hdr(skb)->protocol) {
|
||||
case IPPROTO_TCP:
|
||||
err = skb_maybe_pull_tail(skb,
|
||||
off + sizeof(struct tcphdr),
|
||||
MAX_IP_HDR_LEN);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
|
||||
if (!skb_partial_csum_set(skb, off,
|
||||
offsetof(struct tcphdr, check))) {
|
||||
err = -EPROTO;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (recalculate)
|
||||
tcp_hdr(skb)->check =
|
||||
~csum_tcpudp_magic(ip_hdr(skb)->saddr,
|
||||
ip_hdr(skb)->daddr,
|
||||
skb->len - off,
|
||||
IPPROTO_TCP, 0);
|
||||
break;
|
||||
case IPPROTO_UDP:
|
||||
err = skb_maybe_pull_tail(skb,
|
||||
off + sizeof(struct udphdr),
|
||||
MAX_IP_HDR_LEN);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
|
||||
if (!skb_partial_csum_set(skb, off,
|
||||
offsetof(struct udphdr, check))) {
|
||||
err = -EPROTO;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (recalculate)
|
||||
udp_hdr(skb)->check =
|
||||
~csum_tcpudp_magic(ip_hdr(skb)->saddr,
|
||||
ip_hdr(skb)->daddr,
|
||||
skb->len - off,
|
||||
IPPROTO_UDP, 0);
|
||||
break;
|
||||
default:
|
||||
goto out;
|
||||
}
|
||||
|
||||
err = 0;
|
||||
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
/* This value should be large enough to cover a tagged ethernet header plus
|
||||
* an IPv6 header, all options, and a maximal TCP or UDP header.
|
||||
*/
|
||||
#define MAX_IPV6_HDR_LEN 256
|
||||
|
||||
#define OPT_HDR(type, skb, off) \
|
||||
(type *)(skb_network_header(skb) + (off))
|
||||
|
||||
static int skb_checksum_setup_ipv6(struct sk_buff *skb, bool recalculate)
|
||||
{
|
||||
int err;
|
||||
u8 nexthdr;
|
||||
unsigned int off;
|
||||
unsigned int len;
|
||||
bool fragment;
|
||||
bool done;
|
||||
|
||||
fragment = false;
|
||||
done = false;
|
||||
|
||||
off = sizeof(struct ipv6hdr);
|
||||
|
||||
err = skb_maybe_pull_tail(skb, off, MAX_IPV6_HDR_LEN);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
|
||||
nexthdr = ipv6_hdr(skb)->nexthdr;
|
||||
|
||||
len = sizeof(struct ipv6hdr) + ntohs(ipv6_hdr(skb)->payload_len);
|
||||
while (off <= len && !done) {
|
||||
switch (nexthdr) {
|
||||
case IPPROTO_DSTOPTS:
|
||||
case IPPROTO_HOPOPTS:
|
||||
case IPPROTO_ROUTING: {
|
||||
struct ipv6_opt_hdr *hp;
|
||||
|
||||
err = skb_maybe_pull_tail(skb,
|
||||
off +
|
||||
sizeof(struct ipv6_opt_hdr),
|
||||
MAX_IPV6_HDR_LEN);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
|
||||
hp = OPT_HDR(struct ipv6_opt_hdr, skb, off);
|
||||
nexthdr = hp->nexthdr;
|
||||
off += ipv6_optlen(hp);
|
||||
break;
|
||||
}
|
||||
case IPPROTO_AH: {
|
||||
struct ip_auth_hdr *hp;
|
||||
|
||||
err = skb_maybe_pull_tail(skb,
|
||||
off +
|
||||
sizeof(struct ip_auth_hdr),
|
||||
MAX_IPV6_HDR_LEN);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
|
||||
hp = OPT_HDR(struct ip_auth_hdr, skb, off);
|
||||
nexthdr = hp->nexthdr;
|
||||
off += ipv6_authlen(hp);
|
||||
break;
|
||||
}
|
||||
case IPPROTO_FRAGMENT: {
|
||||
struct frag_hdr *hp;
|
||||
|
||||
err = skb_maybe_pull_tail(skb,
|
||||
off +
|
||||
sizeof(struct frag_hdr),
|
||||
MAX_IPV6_HDR_LEN);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
|
||||
hp = OPT_HDR(struct frag_hdr, skb, off);
|
||||
|
||||
if (hp->frag_off & htons(IP6_OFFSET | IP6_MF))
|
||||
fragment = true;
|
||||
|
||||
nexthdr = hp->nexthdr;
|
||||
off += sizeof(struct frag_hdr);
|
||||
break;
|
||||
}
|
||||
default:
|
||||
done = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
err = -EPROTO;
|
||||
|
||||
if (!done || fragment)
|
||||
goto out;
|
||||
|
||||
switch (nexthdr) {
|
||||
case IPPROTO_TCP:
|
||||
err = skb_maybe_pull_tail(skb,
|
||||
off + sizeof(struct tcphdr),
|
||||
MAX_IPV6_HDR_LEN);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
|
||||
if (!skb_partial_csum_set(skb, off,
|
||||
offsetof(struct tcphdr, check))) {
|
||||
err = -EPROTO;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (recalculate)
|
||||
tcp_hdr(skb)->check =
|
||||
~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
|
||||
&ipv6_hdr(skb)->daddr,
|
||||
skb->len - off,
|
||||
IPPROTO_TCP, 0);
|
||||
break;
|
||||
case IPPROTO_UDP:
|
||||
err = skb_maybe_pull_tail(skb,
|
||||
off + sizeof(struct udphdr),
|
||||
MAX_IPV6_HDR_LEN);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
|
||||
if (!skb_partial_csum_set(skb, off,
|
||||
offsetof(struct udphdr, check))) {
|
||||
err = -EPROTO;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (recalculate)
|
||||
udp_hdr(skb)->check =
|
||||
~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
|
||||
&ipv6_hdr(skb)->daddr,
|
||||
skb->len - off,
|
||||
IPPROTO_UDP, 0);
|
||||
break;
|
||||
default:
|
||||
goto out;
|
||||
}
|
||||
|
||||
err = 0;
|
||||
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* skb_checksum_setup - set up partial checksum offset
|
||||
* @skb: the skb to set up
|
||||
* @recalculate: if true the pseudo-header checksum will be recalculated
|
||||
*/
|
||||
int skb_checksum_setup(struct sk_buff *skb, bool recalculate)
|
||||
{
|
||||
int err;
|
||||
|
||||
switch (skb->protocol) {
|
||||
case htons(ETH_P_IP):
|
||||
err = skb_checksum_setup_ip(skb, recalculate);
|
||||
break;
|
||||
|
||||
case htons(ETH_P_IPV6):
|
||||
err = skb_checksum_setup_ipv6(skb, recalculate);
|
||||
break;
|
||||
|
||||
default:
|
||||
err = -EPROTO;
|
||||
break;
|
||||
}
|
||||
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL(skb_checksum_setup);
|
||||
|
||||
void __skb_warn_lro_forwarding(const struct sk_buff *skb)
|
||||
{
|
||||
net_warn_ratelimited("%s: received packets cannot be forwarded while LRO is enabled\n",
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user