/* * netsniff-ng - the packet sniffing beast * Subject to the GPL, version 2. */ #include #include "die.h" #include "dev.h" #include "csum.h" #include "built_in.h" #include "trafgen_l2.h" #include "trafgen_l3.h" #include "trafgen_proto.h" #include "trafgen_conf.h" static struct proto_field ipv4_fields[] = { { .id = IP4_VER, .len = 1, .offset = 0, .shift = 4, .mask = 0xf0 }, { .id = IP4_IHL, .len = 1, .offset = 0, .shift = 0, .mask = 0x0f }, { .id = IP4_DSCP, .len = 1, .offset = 1, .shift = 2, .mask = 0xfc }, { .id = IP4_ECN, .len = 1, .offset = 1, .shift = 0, .mask = 0x03 }, { .id = IP4_TOS, .len = 1, .offset = 1 }, { .id = IP4_LEN, .len = 2, .offset = 2 }, { .id = IP4_ID, .len = 2, .offset = 4 }, { .id = IP4_FLAGS, .len = 2, .offset = 6, .shift = 13, .mask = 0xe000 }, { .id = IP4_MF, .len = 2, .offset = 6, .shift = 13, .mask = 0x2000 }, { .id = IP4_DF, .len = 2, .offset = 6, .shift = 14, .mask = 0x4000 }, { .id = IP4_FRAG_OFFS, .len = 2, .offset = 6, .shift = 0, .mask = 0x1fff }, { .id = IP4_TTL, .len = 1, .offset = 8 }, { .id = IP4_PROTO, .len = 1, .offset = 9 }, { .id = IP4_CSUM, .len = 2, .offset = 10 }, { .id = IP4_SADDR, .len = 4, .offset = 12 }, { .id = IP4_DADDR, .len = 4, .offset = 16 }, }; static void ipv4_header_init(struct proto_hdr *hdr) { const char *dev = proto_dev_get(); /* In case of tun interface we do not need to create Ethernet header */ if (dev && device_mtu(dev) && device_type(dev) != ARPHRD_NONE) proto_lower_default_add(hdr, PROTO_ETH); proto_header_fields_add(hdr, ipv4_fields, array_size(ipv4_fields)); proto_hdr_field_set_default_u8(hdr, IP4_VER, 4); proto_hdr_field_set_default_u8(hdr, IP4_IHL, 5); proto_hdr_field_set_default_dev_ipv4(hdr, IP4_SADDR); } static void ipv4_field_changed(struct proto_field *field) { field->hdr->is_csum_valid = false; if (field->id == IP4_SADDR || field->id == IP4_DADDR) { struct proto_hdr *upper = proto_upper_header(field->hdr); if (upper && (upper->ops->id == PROTO_UDP || upper->ops->id == PROTO_TCP)) upper->is_csum_valid = false; } } static void ipv4_csum_update(struct proto_hdr *hdr) { struct packet *pkt; uint16_t csum; if (hdr->is_csum_valid) return; if (proto_hdr_field_is_set(hdr, IP4_CSUM)) return; pkt = packet_get(hdr->pkt_id); proto_hdr_field_set_default_u16(hdr, IP4_CSUM, 0); csum = htons(calc_csum(&pkt->payload[hdr->pkt_offset], hdr->len)); proto_hdr_field_set_default_u16(hdr, IP4_CSUM, bswap_16(csum)); hdr->is_csum_valid = true; } static void ipv4_packet_finish(struct proto_hdr *hdr) { struct packet *pkt = current_packet(); uint16_t total_len; total_len = pkt->len - hdr->pkt_offset; proto_hdr_field_set_default_be16(hdr, IP4_LEN, total_len); ipv4_csum_update(hdr); } static void ipv4_set_next_proto(struct proto_hdr *hdr, enum proto_id pid) { uint8_t ip_proto; switch (pid) { case PROTO_IP4: ip_proto = IPPROTO_IPIP; break; case PROTO_IP6: ip_proto = IPPROTO_IPV6; break; case PROTO_ICMP4: ip_proto = IPPROTO_ICMP; break; case PROTO_UDP: ip_proto = IPPROTO_UDP; break; case PROTO_TCP: ip_proto = IPPROTO_TCP; break; default: bug(); } proto_hdr_field_set_default_u8(hdr, IP4_PROTO, ip_proto); } static const struct proto_ops ipv4_proto_ops = { .id = PROTO_IP4, .layer = PROTO_L3, .header_init = ipv4_header_init, .packet_update = ipv4_csum_update, .field_changed = ipv4_field_changed, .packet_finish = ipv4_packet_finish, .set_next_proto = ipv4_set_next_proto, }; static struct proto_field ipv6_fields[] = { { .id = IP6_VER, .len = 4, .offset = 0, .shift = 28, .mask = 0xf0000000 }, { .id = IP6_CLASS, .len = 4, .offset = 0, .shift = 20, .mask = 0x0ff00000 }, { .id = IP6_FLOW_LBL, .len = 4, .offset = 0, .shift = 0, .mask = 0x000fffff }, { .id = IP6_LEN, .len = 2, .offset = 4 }, { .id = IP6_NEXT_HDR, .len = 1, .offset = 6 }, { .id = IP6_HOP_LIMIT, .len = 1, .offset = 7 }, { .id = IP6_SADDR, .len = 16, .offset = 8 }, { .id = IP6_DADDR, .len = 16, .offset = 24 }, }; static void ipv6_header_init(struct proto_hdr *hdr) { const char *dev = proto_dev_get(); /* In case of tun interface we do not need to create Ethernet header */ if (dev && device_mtu(dev) && device_type(dev) != ARPHRD_NONE) proto_lower_default_add(hdr, PROTO_ETH); proto_header_fields_add(hdr, ipv6_fields, array_size(ipv6_fields)); proto_hdr_field_set_default_be32(hdr, IP6_VER, 6); proto_hdr_field_set_default_dev_ipv6(hdr, IP6_SADDR); } static void ipv6_field_changed(struct proto_field *field) { if (field->id == IP6_SADDR || field->id == IP6_DADDR) { struct proto_hdr *upper = proto_upper_header(field->hdr); if (upper && (upper->ops->id == PROTO_UDP || upper->ops->id == PROTO_TCP)) upper->is_csum_valid = false; } } #define IPV6_HDR_LEN 40 static void ipv6_packet_finish(struct proto_hdr *hdr) { struct packet *pkt = current_packet(); uint16_t total_len = pkt->len - hdr->pkt_offset - IPV6_HDR_LEN; proto_hdr_field_set_default_be16(hdr, IP6_LEN, total_len); } static void ipv6_set_next_proto(struct proto_hdr *hdr, enum proto_id pid) { uint8_t ip_proto; switch (pid) { case PROTO_ICMP6: ip_proto = IPPROTO_ICMPV6; break; case PROTO_UDP: ip_proto = IPPROTO_UDP; break; case PROTO_TCP: ip_proto = IPPROTO_TCP; break; default: bug(); } proto_hdr_field_set_default_u8(hdr, IP6_NEXT_HDR, ip_proto); } static const struct proto_ops ipv6_proto_ops = { .id = PROTO_IP6, .layer = PROTO_L3, .header_init = ipv6_header_init, .field_changed = ipv6_field_changed, .packet_finish = ipv6_packet_finish, .set_next_proto = ipv6_set_next_proto, }; void protos_l3_init(void) { proto_ops_register(&ipv4_proto_ops); proto_ops_register(&ipv6_proto_ops); } 'oid'>c14024dbb156c8392908aaa822097d27c6af8ec8 (diff)
block: don't try Write Same from __blkdev_issue_zeroout
Write Same can return an error asynchronously if it turns out the underlying SCSI device does not support Write Same, which makes a proper fallback to other methods in __blkdev_issue_zeroout impossible. Thus only issue a Write Same from blkdev_issue_zeroout an don't try it at all from __blkdev_issue_zeroout as a non-invasive workaround. Signed-off-by: Christoph Hellwig <hch@lst.de> Reported-by: Junichi Nomura <j-nomura@ce.jp.nec.com> Fixes: e73c23ff ("block: add async variant of blkdev_issue_zeroout") Tested-by: Junichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'net/x25/Kconfig')